diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index d326b38e49c..5e4fc315deb 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,13 +1,8 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-# \todo Eliminate duplication when/if Dependabot supports YAML anchors
+# File generated by "make dependabot-generate"; DO NOT EDIT.
 
 version: 2
 updates:
-  -
-    package-ecosystem: github-actions
+  - package-ecosystem: github-actions
     directory: /
     labels:
       - dependencies
@@ -16,8 +11,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /
     labels:
       - dependencies
@@ -26,18 +20,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /bridge/opentracing
-    labels:
-      - dependencies
-      - go
-      - "Skip Changelog"
-    schedule:
-      day: sunday
-      interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /bridge/opencensus
     labels:
       - dependencies
@@ -46,8 +29,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /bridge/opencensus/test
     labels:
       - dependencies
@@ -56,9 +38,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /example/fib
+  - package-ecosystem: gomod
+    directory: /bridge/opentracing
     labels:
       - dependencies
       - go
@@ -66,9 +47,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /example/prom-collector
+  - package-ecosystem: gomod
+    directory: /example/fib
     labels:
       - dependencies
       - go
@@ -76,8 +56,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/jaeger
     labels:
       - dependencies
@@ -86,8 +65,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/namedtracer
     labels:
       - dependencies
@@ -96,8 +74,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/opencensus
     labels:
       - dependencies
@@ -106,8 +83,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/otel-collector
     labels:
       - dependencies
@@ -116,8 +92,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/passthrough
     labels:
       - dependencies
@@ -126,8 +101,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/prometheus
     labels:
       - dependencies
@@ -136,8 +110,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /example/zipkin
     labels:
       - dependencies
@@ -146,9 +119,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/prometheus
+  - package-ecosystem: gomod
+    directory: /exporters/jaeger
     labels:
       - dependencies
       - go
@@ -156,9 +128,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/stdout/stdouttrace
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/internal/retry
     labels:
       - dependencies
       - go
@@ -166,9 +137,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/stdout/stdoutmetric
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlpmetric
     labels:
       - dependencies
       - go
@@ -176,9 +146,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/jaeger
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlpmetric/otlpmetricgrpc
     labels:
       - dependencies
       - go
@@ -186,9 +155,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/zipkin
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlpmetric/otlpmetrichttp
     labels:
       - dependencies
       - go
@@ -196,9 +164,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /sdk
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlptrace
     labels:
       - dependencies
       - go
@@ -206,9 +173,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /internal/metric
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlptrace/otlptracegrpc
     labels:
       - dependencies
       - go
@@ -216,9 +182,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /internal/tools
+  - package-ecosystem: gomod
+    directory: /exporters/otlp/otlptrace/otlptracehttp
     labels:
       - dependencies
       - go
@@ -226,9 +191,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /metric
+  - package-ecosystem: gomod
+    directory: /exporters/prometheus
     labels:
       - dependencies
       - go
@@ -236,9 +200,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /sdk/export/metric
+  - package-ecosystem: gomod
+    directory: /exporters/stdout/stdoutmetric
     labels:
       - dependencies
       - go
@@ -246,9 +209,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /sdk/metric
+  - package-ecosystem: gomod
+    directory: /exporters/stdout/stdouttrace
     labels:
       - dependencies
       - go
@@ -256,9 +218,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /internal/tools/semconv-gen
+  - package-ecosystem: gomod
+    directory: /exporters/zipkin
     labels:
       - dependencies
       - go
@@ -266,9 +227,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/internal/retry
+  - package-ecosystem: gomod
+    directory: /internal/tools
     labels:
       - dependencies
       - go
@@ -276,9 +236,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlptrace
+  - package-ecosystem: gomod
+    directory: /metric
     labels:
       - dependencies
       - go
@@ -286,9 +245,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlptrace/otlptracegrpc
+  - package-ecosystem: gomod
+    directory: /schema
     labels:
       - dependencies
       - go
@@ -296,9 +254,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlptrace/otlptracehttp
+  - package-ecosystem: gomod
+    directory: /sdk
     labels:
       - dependencies
       - go
@@ -306,9 +263,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlpmetric
+  - package-ecosystem: gomod
+    directory: /sdk/export/metric
     labels:
       - dependencies
       - go
@@ -316,9 +272,8 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlpmetric/otlpmetricgrpc
+  - package-ecosystem: gomod
+    directory: /sdk/metric
     labels:
       - dependencies
       - go
@@ -326,8 +281,7 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
+  - package-ecosystem: gomod
     directory: /trace
     labels:
       - dependencies
@@ -336,24 +290,3 @@ updates:
     schedule:
       day: sunday
       interval: weekly
-  -
-    package-ecosystem: gomod
-    directory: /exporters/otlp/otlpmetric/otlpmetrichttp
-    labels:
-      - dependencies
-      - go
-      - "Skip Changelog"
-    schedule:
-      day: sunday
-      interval: weekly
-
-  -
-    package-ecosystem: gomod
-    directory: /schema
-    labels:
-      - dependencies
-      - go
-      - "Skip Changelog"
-    schedule:
-      day: sunday
-      interval: weekly
diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
new file mode 100644
index 00000000000..c14b91aa4f1
--- /dev/null
+++ b/.github/workflows/benchmark.yml
@@ -0,0 +1,32 @@
+name: Benchmark
+on:
+  push:
+    branches:
+      - main
+env:
+  DEFAULT_GO_VERSION: 1.16
+jobs:
+  benchmark:
+    name: Benchmarks
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.4.0
+      - uses: actions/setup-go@v2.2.0
+        with:
+          go-version: ${{ env.DEFAULT_GO_VERSION }}
+      - name: Run benchmarks
+        run: make test-bench | tee output.txt
+      - name: Download previous benchmark data
+        uses: actions/cache@v2.1.7
+        with:
+          path: ./benchmarks
+          key: ${{ runner.os }}-benchmark
+      - name: Store benchmarks result
+        uses: benchmark-action/github-action-benchmark@v1.13.0
+        with:
+          name: Benchmarks
+          tool: 'go'
+          output-file-path: output.txt
+          external-data-json-path: ./benchmarks/data.json
+          auto-push: false
+          fail-on-alert: true
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 09abecea0cb..3cb2893edcf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2.1.5
+        uses: actions/setup-go@v2.2.0
         with:
           go-version: ${{ env.DEFAULT_GO_VERSION }}
       - name: Checkout Repo
@@ -40,7 +40,7 @@ jobs:
       - name: Run linters
         run: make dependabot-check license-check lint vanity-import-check
       - name: Build
-        run: make examples build
+        run: make build
       - name: Check clean repository
         run: make check-clean-work-tree
 
@@ -48,7 +48,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2.1.5
+        uses: actions/setup-go@v2.2.0
         with:
           go-version: ${{ env.DEFAULT_GO_VERSION }}
       - name: Checkout Repo
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2.1.5
+        uses: actions/setup-go@v2.2.0
         with:
           go-version: ${{ env.DEFAULT_GO_VERSION }}
       - name: Checkout Repo
@@ -123,7 +123,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Go
-        uses: actions/setup-go@v2.1.5
+        uses: actions/setup-go@v2.2.0
         with:
           go-version: ${{ matrix.go-version }}
       - name: Checkout code
diff --git a/.github/workflows/dependabot.yml b/.github/workflows/dependabot.yml
index 4ff7b99d7f3..b679cbaf7f9 100644
--- a/.github/workflows/dependabot.yml
+++ b/.github/workflows/dependabot.yml
@@ -11,7 +11,7 @@ jobs:
     - uses: actions/checkout@v2
       with:
         ref: ${{ github.head_ref }}
-    - uses: actions/setup-go@v2.1.5
+    - uses: actions/setup-go@v2.2.0
       with:
         go-version: '^1.16.0'
     - uses: evantorrie/mott-the-tidier@v1-beta
diff --git a/.gitignore b/.gitignore
index 759cf53e002..99230bae28b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,5 @@ gen/
 /example/opencensus/opencensus
 /example/passthrough/passthrough
 /example/prometheus/prometheus
-/example/prom-collector/prom-collector
 /example/zipkin/zipkin
 /example/otel-collector/otel-collector
diff --git a/.golangci.yml b/.golangci.yml
index d40bdedc397..7a5fdc07abf 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -4,11 +4,26 @@ run:
   tests: true #Default
 
 linters:
+  # Disable everything by default so upgrades to not include new "default
+  # enabled" linters.
+  disable-all: true
+  # Specifically enable linters we want to use.
   enable:
-    - misspell
+    - deadcode
+    - errcheck
+    - gofmt
     - goimports
+    - gosimple
+    - govet
+    - ineffassign
+    - misspell
     - revive
-    - gofmt
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+
 
 issues:
   exclude-rules:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 89df8a8c5a0..30b4333441d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,29 +8,77 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### ⚠️ Notice ⚠️
+
+This update is a breaking change of the unstable Metrics API. Code instrumented with the `go.opentelemetry.io/otel/metric` <= v0.27.0 will need to be modified.
+
+### Added
+
+- Added support to configure the span limits with environment variables.
+  The following environment variables are used. (#2606)
+  - `OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT`
+  - `OTEL_SPAN_EVENT_COUNT_LIMIT`
+  - `OTEL_SPAN_LINK_COUNT_LIMIT`
+  
+  If the provided environment variables are invalid (negative), the default values would be used.
+- Rename the `gc` runtime name to `go` (#2560)
+- Log the Exporters configuration in the TracerProviders message. (#2578)
+
+### Changed
+
+- For tracestate's members, prepend the new element and remove the oldest one, which is over capacity (#2592)
+- Add event and link drop counts to the exported data from the `oltptrace` exporter. (#2601)
+- The metrics API has been significantly changed. (#2587)
+- Unify path cleaning functionally in the `otlpmetric` and `otlptrace` config. (#2639)
+- Change the debug message from the `sdk/trace.BatchSpanProcessor` to reflect the count is cumulative. (#2640)
+
+### Fixed
+
+- Remove the OTLP trace exporter limit of SpanEvents when exporting. (#2616)
+- Use port `4318` instead of `4317` for default for the `otlpmetrichttp` and `otlptracehttp` client. (#2614, #2625)
+
+## [1.4.1] - 2022-02-16
+
+### Fixed
+
+- Fix race condition in reading the dropped spans number for the `BatchSpanProcessor`. (#2615)
+
+## [1.4.0] - 2022-02-11
+
 ### Added
 
-- Support `OTEL_EXPORTER_ZIPKIN_ENDPOINT` env to specify zipkin collector endpoint (#2490)
-- Log the configuration of TracerProviders, and Tracers for debugging. To enable use a logger with Verbosity (V level) >=1
-- Added environment variables for: `OTEL_BSP_SCHEDULE_DELAY`, `OTEL_BSP_EXPORT_TIMEOUT`, `OTEL_BSP_MAX_QUEUE_SIZE` and `OTEL_BSP_MAX_EXPORT_BATCH_SIZE` (#2515)
+- Use `OTEL_EXPORTER_ZIPKIN_ENDPOINT` environment variable to specify zipkin collector endpoint. (#2490)
+- Log the configuration of `TracerProvider`s, and `Tracer`s for debugging.
+  To enable use a logger with Verbosity (V level) `>=1`. (#2500)
+- Added support to configure the batch span-processor with environment variables.
+  The following environment variables are used. (#2515)
+  - `OTEL_BSP_SCHEDULE_DELAY`
+  - `OTEL_BSP_EXPORT_TIMEOUT`
+  - `OTEL_BSP_MAX_QUEUE_SIZE`.
+  - `OTEL_BSP_MAX_EXPORT_BATCH_SIZE`
 
 ### Changed
 
-- Jaeger exporter takes into additional 70 bytes overhead into consideration when sending UDP packets (#2489, #2512)
+- Zipkin exporter exports `Resource` attributes in the `Tags` field. (#2589)
 
 ### Deprecated
 
-- Deprecate module `"go.opentelemetry.io/otel/sdk/export/metric"`, new functionality available in "go.opentelemetry.io/otel/sdk/metric" module:
-  - Import path changed `import "go.opentelemetry.io/otel/sdk/export/metric"` to `import go.opentelemetry.io/otel/sdk/metric/export` (#2382).
-- Deprecate `AtomicFieldOffsets`, unnecessary public func (#2445)
+- Deprecate module the `go.opentelemetry.io/otel/sdk/export/metric`.
+  Use the `go.opentelemetry.io/otel/sdk/metric` module instead. (#2382)
+- Deprecate `"go.opentelemetry.io/otel/sdk/metric".AtomicFieldOffsets`. (#2445)
 
 ### Fixed
 
-- Fixes the instrument kind for noop async instruments. (#2461)
+- Fixed the instrument kind for noop async instruments to correctly report an implementation. (#2461)
+- Fix UDP packets overflowing with Jaeger payloads. (#2489, #2512)
 - Change the `otlpmetric.Client` interface's `UploadMetrics` method to accept a single `ResourceMetrics` instead of a slice of them. (#2491)
-- Specify explicit buckets in Prometheus example. (#2493)
+- Specify explicit buckets in Prometheus example, fixing issue where example only has `+inf` bucket. (#2419, #2493)
 - W3C baggage will now decode urlescaped values. (#2529)
 - Baggage members are now only validated once, when calling `NewMember` and not also when adding it to the baggage itself. (#2522)
+- The order attributes are dropped from spans in the `go.opentelemetry.io/otel/sdk/trace` package when capacity is reached is fixed to be in compliance with the OpenTelemetry specification.
+  Instead of dropping the least-recently-used attribute, the last added attribute is dropped.
+  This drop order still only applies to attributes with unique keys not already contained in the span.
+  If an attribute is added with a key already contained in the span, that attribute is updated to the new value being added. (#2576)
 
 ### Removed
 
@@ -1670,7 +1718,9 @@ It contains api and sdk for trace and meter.
 - CircleCI build CI manifest files.
 - CODEOWNERS file to track owners of this project.
 
-[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.3.0...HEAD
+[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.4.1...HEAD
+[1.4.1]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.4.1
+[1.4.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.4.0
 [1.3.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.3.0
 [1.2.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.2.0
 [1.1.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.1.0
diff --git a/CODEOWNERS b/CODEOWNERS
index 808755fe20c..76d959d237a 100644
--- a/CODEOWNERS
+++ b/CODEOWNERS
@@ -12,6 +12,6 @@
 #  https://help.github.com/en/articles/about-code-owners
 #
 
-* @jmacd @MrAlias @Aneurysm9 @evantorrie @XSAM @dashpole @paivagustavo @MadVikingGod @pellared
+* @jmacd @MrAlias @Aneurysm9 @evantorrie @XSAM @dashpole @paivagustavo @MadVikingGod @pellared @hanyuancheung
 
 CODEOWNERS @MrAlias @Aneurysm9 @MadVikingGod
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7dead7084d3..098a7c54fbe 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -508,6 +508,7 @@ Approvers:
 - [David Ashpole](https://github.com/dashpole), Google
 - [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
 - [Robert Pająk](https://github.com/pellared), Splunk
+- [Chester Cheung](https://github.com/hanyuancheung), Tencent
 
 Maintainers:
 
diff --git a/Makefile b/Makefile
index f360b56daf3..bcb3a6d8629 100644
--- a/Makefile
+++ b/Makefile
@@ -12,13 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-EXAMPLES := $(shell ./get_main_pkgs.sh ./example)
 TOOLS_MOD_DIR := ./internal/tools
 
-# All source code and documents. Used in spell check.
 ALL_DOCS := $(shell find . -name '*.md' -type f | sort)
-# All directories with go.mod files related to opentelemetry library. Used for building, testing and linting.
-ALL_GO_MOD_DIRS := $(filter-out $(TOOLS_MOD_DIR), $(shell find . -type f -name 'go.mod' -exec dirname {} \; | egrep -v '^./example' | sort)) $(shell find ./example -type f -name 'go.mod' -exec dirname {} \; | sort)
+ALL_GO_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | sort)
+OTEL_GO_MOD_DIRS := $(filter-out $(TOOLS_MOD_DIR), $(ALL_GO_MOD_DIRS))
 ALL_COVERAGE_MOD_DIRS := $(shell find . -type f -name 'go.mod' -exec dirname {} \; | egrep -v '^./example|^$(TOOLS_MOD_DIR)' | sort)
 
 GO = go
@@ -27,8 +25,8 @@ TIMEOUT = 60
 .DEFAULT_GOAL := precommit
 
 .PHONY: precommit ci
-precommit: dependabot-check license-check lint build examples test-default
-ci: precommit check-clean-work-tree test-coverage
+precommit: dependabot-generate license-check misspell go-mod-tidy golangci-lint-fix test-default
+ci: dependabot-check license-check lint vanity-import-check build test-default check-clean-work-tree test-coverage
 
 # Tools
 
@@ -49,6 +47,9 @@ $(TOOLS)/semconvgen: PACKAGE=go.opentelemetry.io/build-tools/semconvgen
 CROSSLINK = $(TOOLS)/crosslink
 $(TOOLS)/crosslink: PACKAGE=go.opentelemetry.io/otel/$(TOOLS_MOD_DIR)/crosslink
 
+DBOTCONF = $(TOOLS)/dbotconf
+$(TOOLS)/dbotconf: PACKAGE=go.opentelemetry.io/otel/$(TOOLS_MOD_DIR)/dbotconf
+
 GOLANGCI_LINT = $(TOOLS)/golangci-lint
 $(TOOLS)/golangci-lint: PACKAGE=github.com/golangci/golangci-lint/cmd/golangci-lint
 
@@ -68,55 +69,51 @@ GOJQ = $(TOOLS)/gojq
 $(TOOLS)/gojq: PACKAGE=github.com/itchyny/gojq/cmd/gojq
 
 .PHONY: tools
-tools: $(CROSSLINK) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(PORTO) $(GOJQ) $(SEMCONVGEN) $(MULTIMOD)
+tools: $(CROSSLINK) $(DBOTCONF) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(PORTO) $(GOJQ) $(SEMCONVGEN) $(MULTIMOD)
 
 # Build
 
-.PHONY: examples generate build
-examples:
-	@set -e; for dir in $(EXAMPLES); do \
-	  echo "$(GO) build $${dir}/..."; \
-	  (cd "$${dir}" && \
-	   $(GO) build .); \
-	done
-
-generate: $(STRINGER) $(PORTO)
-	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
-	  echo "$(GO) generate $${dir}/..."; \
-	  (cd "$${dir}" && \
-	    PATH="$(TOOLS):$${PATH}" $(GO) generate ./... && \
-		$(PORTO) -w .); \
-	done
-
-build: generate
-	# Build all package code including testing code.
-	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
-	  echo "$(GO) build $${dir}/..."; \
-	  (cd "$${dir}" && \
-	    $(GO) build ./... && \
-		$(GO) list ./... \
-		  | grep -v third_party \
-		  | xargs $(GO) test -vet=off -run xxxxxMatchNothingxxxxx >/dev/null); \
-	done
+.PHONY: generate build
+
+generate: $(OTEL_GO_MOD_DIRS:%=generate/%)
+generate/%: DIR=$*
+generate/%: | $(STRINGER) $(PORTO)
+	@echo "$(GO) generate $(DIR)/..." \
+		&& cd $(DIR) \
+		&& PATH="$(TOOLS):$${PATH}" $(GO) generate ./... && $(PORTO) -w .
+
+build: generate $(OTEL_GO_MOD_DIRS:%=build/%) $(OTEL_GO_MOD_DIRS:%=build-tests/%)
+build/%: DIR=$*
+build/%:
+	@echo "$(GO) build $(DIR)/..." \
+		&& cd $(DIR) \
+		&& $(GO) build ./...
+
+build-tests/%: DIR=$*
+build-tests/%:
+	@echo "$(GO) build tests $(DIR)/..." \
+		&& cd $(DIR) \
+		&& $(GO) list ./... \
+		| grep -v third_party \
+		| xargs $(GO) test -vet=off -run xxxxxMatchNothingxxxxx >/dev/null
 
 # Tests
 
 TEST_TARGETS := test-default test-bench test-short test-verbose test-race
 .PHONY: $(TEST_TARGETS) test
-test-default: ARGS=-v -race
+test-default test-race: ARGS=-race
 test-bench:   ARGS=-run=xxxxxMatchNothingxxxxx -test.benchtime=1ms -bench=.
 test-short:   ARGS=-short
-test-verbose: ARGS=-v
-test-race:    ARGS=-race
+test-verbose: ARGS=-v -race
 $(TEST_TARGETS): test
-test:
-	@set -e; for dir in $(ALL_GO_MOD_DIRS); do \
-	  echo "$(GO) test -timeout $(TIMEOUT)s $(ARGS) $${dir}/..."; \
-	  (cd "$${dir}" && \
-	    $(GO) list ./... \
-		  | grep -v third_party \
-		  | xargs $(GO) test -timeout $(TIMEOUT)s $(ARGS)); \
-	done
+test: $(OTEL_GO_MOD_DIRS:%=test/%)
+test/%: DIR=$*
+test/%:
+	@echo "$(GO) test -timeout $(TIMEOUT)s $(ARGS) $(DIR)/..." \
+		&& cd $(DIR) \
+		&& $(GO) list ./... \
+		| grep -v third_party \
+		| xargs $(GO) test -timeout $(TIMEOUT)s $(ARGS)
 
 COVERAGE_MODE    = atomic
 COVERAGE_PROFILE = coverage.out
@@ -134,32 +131,42 @@ test-coverage: | $(GOCOVMERGE)
 	done; \
 	$(GOCOVMERGE) $$(find . -name coverage.out) > coverage.txt
 
+.PHONY: golangci-lint golangci-lint-fix
+golangci-lint-fix: ARGS=--fix
+golangci-lint-fix: golangci-lint
+golangci-lint: $(OTEL_GO_MOD_DIRS:%=golangci-lint/%)
+golangci-lint/%: DIR=$*
+golangci-lint/%: | $(GOLANGCI_LINT)
+	@echo 'golangci-lint $(if $(ARGS),$(ARGS) ,)$(DIR)' \
+		&& cd $(DIR) \
+		&& $(GOLANGCI_LINT) run --allow-serial-runners $(ARGS)
+
+.PHONY: crosslink
+crosslink: | $(CROSSLINK)
+	@echo "cross-linking all go modules" \
+		&& $(CROSSLINK)
+
+.PHONY: go-mod-tidy
+go-mod-tidy: $(ALL_GO_MOD_DIRS:%=go-mod-tidy/%)
+go-mod-tidy/%: DIR=$*
+go-mod-tidy/%: | crosslink
+	@echo "$(GO) mod tidy in $(DIR)" \
+		&& cd $(DIR) \
+		&& $(GO) mod tidy
+
+.PHONY: lint-modules
+lint-modules: go-mod-tidy
+
 .PHONY: lint
-lint: misspell lint-modules | $(GOLANGCI_LINT)
-	set -e; for dir in $(ALL_GO_MOD_DIRS); do \
-	  echo "golangci-lint in $${dir}"; \
-	  (cd "$${dir}" && \
-	    $(GOLANGCI_LINT) run --fix && \
-	    $(GOLANGCI_LINT) run); \
-	done
+lint: misspell lint-modules golangci-lint
 
 .PHONY: vanity-import-check
 vanity-import-check: | $(PORTO)
-	$(PORTO) --include-internal -l .
+	@$(PORTO) --include-internal -l .
 
 .PHONY: misspell
 misspell: | $(MISSPELL)
-	$(MISSPELL) -w $(ALL_DOCS)
-
-.PHONY: lint-modules
-lint-modules: | $(CROSSLINK)
-	set -e; for dir in $(ALL_GO_MOD_DIRS) $(TOOLS_MOD_DIR); do \
-	  echo "$(GO) mod tidy in $${dir}"; \
-	  (cd "$${dir}" && \
-	    $(GO) mod tidy); \
-	done
-	echo "cross-linking all go modules"
-	$(CROSSLINK)
+	@$(MISSPELL) -w $(ALL_DOCS)
 
 .PHONY: license-check
 license-check:
@@ -171,20 +178,27 @@ license-check:
 	           exit 1; \
 	   fi
 
+DEPENDABOT_PATH=./.github/dependabot.yml
 .PHONY: dependabot-check
 dependabot-check:
 	@result=$$( \
 		for f in $$( find . -type f -name go.mod -exec dirname {} \; | sed 's/^.//' ); \
-			do grep -q "directory: \+$$f" .github/dependabot.yml \
+			do grep -q "directory: \+$$f" $(DEPENDABOT_PATH) \
 			|| echo "$$f"; \
 		done; \
 	); \
 	if [ -n "$$result" ]; then \
-		echo "missing go.mod dependabot check:"; echo "$$result"; \
-		echo "new modules need to be added to the .github/dependabot.yml file"; \
+		echo "missing dependabot entry:"; echo "$$result"; \
+		echo "new modules need to be added to the $(DEPENDABOT_PATH) file"; \
+		echo "(run: make dependabot-generate)"; \
 		exit 1; \
 	fi
 
+.PHONY: dependabot-generate
+dependabot-generate: $(DBOTCONF)
+	@echo "gerating dependabot configuration"; \
+	$(DBOTCONF)
+
 .PHONY: check-clean-work-tree
 check-clean-work-tree:
 	@if ! git diff --quiet; then \
diff --git a/attribute/kv.go b/attribute/kv.go
index 8f579338554..1ddf3ce0580 100644
--- a/attribute/kv.go
+++ b/attribute/kv.go
@@ -26,7 +26,7 @@ type KeyValue struct {
 
 // Valid returns if kv is a valid OpenTelemetry attribute.
 func (kv KeyValue) Valid() bool {
-	return kv.Key != "" && kv.Value.Type() != INVALID
+	return kv.Key.Defined() && kv.Value.Type() != INVALID
 }
 
 // Bool creates a KeyValue with a BOOL Value type.
diff --git a/bridge/opencensus/exporter.go b/bridge/opencensus/exporter.go
index e497d95150d..d40ddc9d665 100644
--- a/bridge/opencensus/exporter.go
+++ b/bridge/opencensus/exporter.go
@@ -27,8 +27,7 @@ import (
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric"
-
+	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/metric/unit"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/sdk/metric/export"
@@ -171,17 +170,17 @@ func convertDescriptor(ocDescriptor metricdata.Descriptor) (sdkapi.Descriptor, e
 		// Includes TypeGaugeDistribution, TypeCumulativeDistribution, TypeSummary
 		return sdkapi.Descriptor{}, fmt.Errorf("%w; descriptor type: %v", errConversion, ocDescriptor.Type)
 	}
-	opts := []metric.InstrumentOption{
-		metric.WithDescription(ocDescriptor.Description),
+	opts := []instrument.Option{
+		instrument.WithDescription(ocDescriptor.Description),
 	}
 	switch ocDescriptor.Unit {
 	case metricdata.UnitDimensionless:
-		opts = append(opts, metric.WithUnit(unit.Dimensionless))
+		opts = append(opts, instrument.WithUnit(unit.Dimensionless))
 	case metricdata.UnitBytes:
-		opts = append(opts, metric.WithUnit(unit.Bytes))
+		opts = append(opts, instrument.WithUnit(unit.Bytes))
 	case metricdata.UnitMilliseconds:
-		opts = append(opts, metric.WithUnit(unit.Milliseconds))
+		opts = append(opts, instrument.WithUnit(unit.Milliseconds))
 	}
-	cfg := metric.NewInstrumentConfig(opts...)
+	cfg := instrument.NewConfig(opts...)
 	return sdkapi.NewDescriptor(ocDescriptor.Name, ikind, nkind, cfg.Description(), cfg.Unit()), nil
 }
diff --git a/bridge/opencensus/exporter_test.go b/bridge/opencensus/exporter_test.go
index 75a43a64fa0..79e195c1f6c 100644
--- a/bridge/opencensus/exporter_test.go
+++ b/bridge/opencensus/exporter_test.go
@@ -26,7 +26,7 @@ import (
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/metric/unit"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/sdk/metric/controller/controllertest"
@@ -400,8 +400,8 @@ func TestConvertDescriptor(t *testing.T) {
 				"foo",
 				sdkapi.GaugeObserverInstrumentKind,
 				number.Int64Kind,
-				metric.WithDescription("bar"),
-				metric.WithUnit(unit.Bytes),
+				instrument.WithDescription("bar"),
+				instrument.WithUnit(unit.Bytes),
 			),
 		},
 		{
@@ -416,8 +416,8 @@ func TestConvertDescriptor(t *testing.T) {
 				"foo",
 				sdkapi.GaugeObserverInstrumentKind,
 				number.Float64Kind,
-				metric.WithDescription("bar"),
-				metric.WithUnit(unit.Milliseconds),
+				instrument.WithDescription("bar"),
+				instrument.WithUnit(unit.Milliseconds),
 			),
 		},
 		{
@@ -432,8 +432,8 @@ func TestConvertDescriptor(t *testing.T) {
 				"foo",
 				sdkapi.CounterObserverInstrumentKind,
 				number.Int64Kind,
-				metric.WithDescription("bar"),
-				metric.WithUnit(unit.Dimensionless),
+				instrument.WithDescription("bar"),
+				instrument.WithUnit(unit.Dimensionless),
 			),
 		},
 		{
@@ -448,8 +448,8 @@ func TestConvertDescriptor(t *testing.T) {
 				"foo",
 				sdkapi.CounterObserverInstrumentKind,
 				number.Float64Kind,
-				metric.WithDescription("bar"),
-				metric.WithUnit(unit.Dimensionless),
+				instrument.WithDescription("bar"),
+				instrument.WithUnit(unit.Dimensionless),
 			),
 		},
 		{
diff --git a/bridge/opencensus/go.mod b/bridge/opencensus/go.mod
index 30a69366c61..db2733fc484 100644
--- a/bridge/opencensus/go.mod
+++ b/bridge/opencensus/go.mod
@@ -4,11 +4,11 @@ go 1.16
 
 require (
 	go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel => ../..
@@ -25,8 +25,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
diff --git a/bridge/opencensus/test/go.mod b/bridge/opencensus/test/go.mod
index 95c30b75eaa..b262f82d5e8 100644
--- a/bridge/opencensus/test/go.mod
+++ b/bridge/opencensus/test/go.mod
@@ -4,10 +4,10 @@ go 1.16
 
 require (
 	go.opencensus.io v0.23.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/bridge/opencensus v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/bridge/opencensus v0.27.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel => ../../..
diff --git a/bridge/opentracing/go.mod b/bridge/opentracing/go.mod
index fb9ff78019a..6a36fde8822 100644
--- a/bridge/opentracing/go.mod
+++ b/bridge/opentracing/go.mod
@@ -6,8 +6,8 @@ replace go.opentelemetry.io/otel => ../..
 
 require (
 	github.com/opentracing/opentracing-go v1.2.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../opencensus
@@ -22,8 +22,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
diff --git a/example/fib/go.mod b/example/fib/go.mod
index 6c36e2a64a8..f32a17d8ed9 100644
--- a/example/fib/go.mod
+++ b/example/fib/go.mod
@@ -3,10 +3,10 @@ module go.opentelemetry.io/otel/example/fib
 go 1.16
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel => ../..
diff --git a/example/jaeger/go.mod b/example/jaeger/go.mod
index af7f7f20b68..c67a139299d 100644
--- a/example/jaeger/go.mod
+++ b/example/jaeger/go.mod
@@ -9,9 +9,9 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/jaeger v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/jaeger v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -26,8 +26,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/namedtracer/go.mod b/example/namedtracer/go.mod
index a9452a19c75..3873edf2951 100644
--- a/example/namedtracer/go.mod
+++ b/example/namedtracer/go.mod
@@ -9,10 +9,10 @@ replace (
 
 require (
 	github.com/go-logr/stdr v1.2.2
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/opencensus/go.mod b/example/opencensus/go.mod
index a1fb87122a0..ba0fa9db3de 100644
--- a/example/opencensus/go.mod
+++ b/example/opencensus/go.mod
@@ -10,12 +10,12 @@ replace (
 
 require (
 	go.opencensus.io v0.22.6-0.20201102222123-380f4078db9f
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/bridge/opencensus v0.26.0
-	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.26.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/bridge/opencensus v0.27.1
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.27.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 )
 
 replace go.opentelemetry.io/otel/bridge/opentracing => ../../bridge/opentracing
@@ -28,8 +28,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ./
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/otel-collector/Makefile b/example/otel-collector/Makefile
index 606e8f86ef4..47c560b34c8 100644
--- a/example/otel-collector/Makefile
+++ b/example/otel-collector/Makefile
@@ -3,15 +3,7 @@ namespace-k8s:
 
 jaeger-operator-k8s:
 	# Create the jaeger operator and necessary artifacts in ns observability
-	kubectl create -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/crds/jaegertracing.io_jaegers_crd.yaml
-	kubectl create -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/service_account.yaml
-	kubectl create -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/role.yaml
-	kubectl create -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/role_binding.yaml
-	kubectl create -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/operator.yaml
-
-	# Create the cluster role & bindings
-	kubectl create -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/cluster_role.yaml
-	kubectl create -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/cluster_role_binding.yaml
+	kubectl create -n observability -f https://github.com/jaegertracing/jaeger-operator/releases/download/v1.31.0/jaeger-operator.yaml
 
 jaeger-k8s:
 	kubectl apply -f k8s/jaeger.yaml
@@ -31,11 +23,4 @@ clean-k8s:
 
 	- kubectl delete -f k8s/jaeger.yaml
 
-	- kubectl delete -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/cluster_role.yaml
-	- kubectl delete -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/cluster_role_binding.yaml
-
-	- kubectl delete -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/crds/jaegertracing.io_jaegers_crd.yaml
-	- kubectl delete -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/service_account.yaml
-	- kubectl delete -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/role.yaml
-	- kubectl delete -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/role_binding.yaml
-	- kubectl delete -n observability -f https://raw.githubusercontent.com/jaegertracing/jaeger-operator/master/deploy/operator.yaml
+	- kubectl delete -n observability -f https://github.com/jaegertracing/jaeger-operator/releases/download/v1.31.0/jaeger-operator.yaml
diff --git a/example/otel-collector/go.mod b/example/otel-collector/go.mod
index acbc10cd1bb..bc705fd9bac 100644
--- a/example/otel-collector/go.mod
+++ b/example/otel-collector/go.mod
@@ -8,10 +8,10 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 	google.golang.org/grpc v1.44.0
 )
 
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ./
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/passthrough/go.mod b/example/passthrough/go.mod
index 0c023e59c36..b738a24061b 100644
--- a/example/passthrough/go.mod
+++ b/example/passthrough/go.mod
@@ -3,10 +3,10 @@ module go.opentelemetry.io/otel/example/passthrough
 go 1.16
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace (
@@ -29,8 +29,6 @@ replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
 replace go.opentelemetry.io/otel/example/passthrough => ./
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/prometheus/go.mod b/example/prometheus/go.mod
index 62bb10691ee..b30c60e547f 100644
--- a/example/prometheus/go.mod
+++ b/example/prometheus/go.mod
@@ -9,10 +9,10 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/prometheus v0.26.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/prometheus v0.27.0
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ./
 
 replace go.opentelemetry.io/otel/example/zipkin => ../zipkin
diff --git a/example/prometheus/main.go b/example/prometheus/main.go
index 8a1248a358e..12148d2595f 100644
--- a/example/prometheus/main.go
+++ b/example/prometheus/main.go
@@ -25,7 +25,7 @@ import (
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/exporters/prometheus"
 	"go.opentelemetry.io/otel/metric"
-	"go.opentelemetry.io/otel/metric/global"
+	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/sdk/metric/aggregator/histogram"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
@@ -35,6 +35,9 @@ import (
 
 var (
 	lemonsKey = attribute.Key("ex.com/lemons")
+
+	// TODO Bring back Global package
+	meterProvider metric.MeterProvider
 )
 
 func initMeter() {
@@ -54,7 +57,9 @@ func initMeter() {
 	if err != nil {
 		log.Panicf("failed to initialize prometheus exporter %v", err)
 	}
-	global.SetMeterProvider(exporter.MeterProvider())
+	// TODO Bring back Global package
+	// global.SetMeterProvider(exporter.MeterProvider())
+	meterProvider = exporter.MeterProvider()
 
 	http.HandleFunc("/", exporter.ServeHTTP)
 	go func() {
@@ -67,23 +72,33 @@ func initMeter() {
 func main() {
 	initMeter()
 
-	meter := global.Meter("ex.com/basic")
+	// TODO Bring back Global package
+	// meter := global.Meter("ex.com/basic")
+	meter := meterProvider.Meter("ex.com/basic")
 	observerLock := new(sync.RWMutex)
 	observerValueToReport := new(float64)
 	observerLabelsToReport := new([]attribute.KeyValue)
-	cb := func(_ context.Context, result metric.Float64ObserverResult) {
+
+	gaugeObserver, err := meter.AsyncFloat64().Gauge("ex.com.one")
+	if err != nil {
+		log.Panicf("failed to initialize instrument: %v", err)
+	}
+	_ = meter.RegisterCallback([]instrument.Asynchronous{gaugeObserver}, func(ctx context.Context) {
 		(*observerLock).RLock()
 		value := *observerValueToReport
 		labels := *observerLabelsToReport
 		(*observerLock).RUnlock()
-		result.Observe(value, labels...)
-	}
-	_ = metric.Must(meter).NewFloat64GaugeObserver("ex.com.one", cb,
-		metric.WithDescription("A GaugeObserver set to 1.0"),
-	)
+		gaugeObserver.Observe(ctx, value, labels...)
+	})
 
-	histogram := metric.Must(meter).NewFloat64Histogram("ex.com.two")
-	counter := metric.Must(meter).NewFloat64Counter("ex.com.three")
+	histogram, err := meter.SyncFloat64().Histogram("ex.com.two")
+	if err != nil {
+		log.Panicf("failed to initialize instrument: %v", err)
+	}
+	counter, err := meter.SyncFloat64().Counter("ex.com.three")
+	if err != nil {
+		log.Panicf("failed to initialize instrument: %v", err)
+	}
 
 	commonLabels := []attribute.KeyValue{lemonsKey.Int(10), attribute.String("A", "1"), attribute.String("B", "2"), attribute.String("C", "3")}
 	notSoCommonLabels := []attribute.KeyValue{lemonsKey.Int(13)}
@@ -94,12 +109,9 @@ func main() {
 	*observerValueToReport = 1.0
 	*observerLabelsToReport = commonLabels
 	(*observerLock).Unlock()
-	meter.RecordBatch(
-		ctx,
-		commonLabels,
-		histogram.Measurement(2.0),
-		counter.Measurement(12.0),
-	)
+
+	histogram.Record(ctx, 2.0, commonLabels...)
+	counter.Add(ctx, 12.0, commonLabels...)
 
 	time.Sleep(5 * time.Second)
 
@@ -107,12 +119,8 @@ func main() {
 	*observerValueToReport = 1.0
 	*observerLabelsToReport = notSoCommonLabels
 	(*observerLock).Unlock()
-	meter.RecordBatch(
-		ctx,
-		notSoCommonLabels,
-		histogram.Measurement(2.0),
-		counter.Measurement(22.0),
-	)
+	histogram.Record(ctx, 2.0, notSoCommonLabels...)
+	counter.Add(ctx, 22.0, notSoCommonLabels...)
 
 	time.Sleep(5 * time.Second)
 
@@ -120,12 +128,8 @@ func main() {
 	*observerValueToReport = 13.0
 	*observerLabelsToReport = commonLabels
 	(*observerLock).Unlock()
-	meter.RecordBatch(
-		ctx,
-		commonLabels,
-		histogram.Measurement(12.0),
-		counter.Measurement(13.0),
-	)
+	histogram.Record(ctx, 12.0, commonLabels...)
+	counter.Add(ctx, 13.0, commonLabels...)
 
 	fmt.Println("Example finished updating, please visit :2222")
 
diff --git a/example/zipkin/go.mod b/example/zipkin/go.mod
index da82762c21e..c47de71dfda 100644
--- a/example/zipkin/go.mod
+++ b/example/zipkin/go.mod
@@ -9,10 +9,10 @@ replace (
 )
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/zipkin v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/zipkin v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ./
diff --git a/exporters/jaeger/go.mod b/exporters/jaeger/go.mod
index ce530fbdfa2..265bbc92eb3 100644
--- a/exporters/jaeger/go.mod
+++ b/exporters/jaeger/go.mod
@@ -5,9 +5,9 @@ go 1.16
 require (
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -22,8 +22,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
diff --git a/exporters/jaeger/jaeger.go b/exporters/jaeger/jaeger.go
index 22a5ed1afa8..d87b79621ef 100644
--- a/exporters/jaeger/jaeger.go
+++ b/exporters/jaeger/jaeger.go
@@ -123,6 +123,15 @@ func (e *Exporter) Shutdown(ctx context.Context) error {
 	return e.uploader.shutdown(ctx)
 }
 
+// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+func (e *Exporter) MarshalLog() interface{} {
+	return struct {
+		Type string
+	}{
+		Type: "jaeger",
+	}
+}
+
 func spanToThrift(ss sdktrace.ReadOnlySpan) *gen.Span {
 	attr := ss.Attributes()
 	tags := make([]*gen.Tag, 0, len(attr))
diff --git a/exporters/otlp/internal/config.go b/exporters/otlp/internal/config.go
new file mode 100644
index 00000000000..b3fd45d9d31
--- /dev/null
+++ b/exporters/otlp/internal/config.go
@@ -0,0 +1,34 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package internal contains common functionality for all OTLP exporters.
+package internal // import "go.opentelemetry.io/otel/exporters/otlp/internal"
+
+import (
+	"fmt"
+	"path"
+	"strings"
+)
+
+// CleanPath returns a path with all spaces trimmed and all redundancies removed. If urlPath is empty or cleaning it results in an empty string, defaultPath is returned instead.
+func CleanPath(urlPath string, defaultPath string) string {
+	tmp := path.Clean(strings.TrimSpace(urlPath))
+	if tmp == "." {
+		return defaultPath
+	}
+	if !path.IsAbs(tmp) {
+		tmp = fmt.Sprintf("/%s", tmp)
+	}
+	return tmp
+}
diff --git a/exporters/otlp/internal/config_test.go b/exporters/otlp/internal/config_test.go
new file mode 100644
index 00000000000..92a819a1f2b
--- /dev/null
+++ b/exporters/otlp/internal/config_test.go
@@ -0,0 +1,83 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import "testing"
+
+func TestCleanPath(t *testing.T) {
+	type args struct {
+		urlPath     string
+		defaultPath string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "clean empty path",
+			args: args{
+				urlPath:     "",
+				defaultPath: "DefaultPath",
+			},
+			want: "DefaultPath",
+		},
+		{
+			name: "clean metrics path",
+			args: args{
+				urlPath:     "/prefix/v1/metrics",
+				defaultPath: "DefaultMetricsPath",
+			},
+			want: "/prefix/v1/metrics",
+		},
+		{
+			name: "clean traces path",
+			args: args{
+				urlPath:     "https://env_endpoint",
+				defaultPath: "DefaultTracesPath",
+			},
+			want: "/https:/env_endpoint",
+		},
+		{
+			name: "spaces trimmed",
+			args: args{
+				urlPath: " /dir",
+			},
+			want: "/dir",
+		},
+		{
+			name: "clean path empty",
+			args: args{
+				urlPath:     "dir/..",
+				defaultPath: "DefaultTracesPath",
+			},
+			want: "DefaultTracesPath",
+		},
+		{
+			name: "make absolute",
+			args: args{
+				urlPath: "dir/a",
+			},
+			want: "/dir/a",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := CleanPath(tt.args.urlPath, tt.args.defaultPath); got != tt.want {
+				t.Errorf("CleanPath() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/exporters/otlp/otlpmetric/go.mod b/exporters/otlp/otlpmetric/go.mod
index ba19e06432d..3a1567c0ec2 100644
--- a/exporters/otlp/otlpmetric/go.mod
+++ b/exporters/otlp/otlpmetric/go.mod
@@ -5,11 +5,11 @@ go 1.16
 require (
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 	go.opentelemetry.io/proto/otlp v0.12.0
 	google.golang.org/grpc v1.44.0
 	google.golang.org/protobuf v1.27.1
diff --git a/exporters/otlp/otlpmetric/internal/otlpconfig/options.go b/exporters/otlp/otlpmetric/internal/otlpconfig/options.go
index fed8a82f1c7..f2c8ee5d21a 100644
--- a/exporters/otlp/otlpmetric/internal/otlpconfig/options.go
+++ b/exporters/otlp/otlpmetric/internal/otlpconfig/options.go
@@ -25,6 +25,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding/gzip"
 
+	"go.opentelemetry.io/otel/exporters/otlp/internal"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
 )
 
@@ -72,24 +73,38 @@ type (
 	}
 )
 
-func NewDefaultConfig() Config {
-	c := Config{
+// NewHTTPConfig returns a new Config with all settings applied from opts and
+// any unset setting using the default HTTP config values.
+func NewHTTPConfig(opts ...HTTPOption) Config {
+	cfg := Config{
 		Metrics: SignalConfig{
-			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorPort),
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorHTTPPort),
 			URLPath:     DefaultMetricsPath,
 			Compression: NoCompression,
 			Timeout:     DefaultTimeout,
 		},
 		RetryConfig: retry.DefaultConfig,
 	}
-
-	return c
+	cfg = ApplyHTTPEnvConfigs(cfg)
+	for _, opt := range opts {
+		cfg = opt.ApplyHTTPOption(cfg)
+	}
+	cfg.Metrics.URLPath = internal.CleanPath(cfg.Metrics.URLPath, DefaultMetricsPath)
+	return cfg
 }
 
 // NewGRPCConfig returns a new Config with all settings applied from opts and
 // any unset setting using the default gRPC config values.
 func NewGRPCConfig(opts ...GRPCOption) Config {
-	cfg := NewDefaultConfig()
+	cfg := Config{
+		Metrics: SignalConfig{
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorGRPCPort),
+			URLPath:     DefaultMetricsPath,
+			Compression: NoCompression,
+			Timeout:     DefaultTimeout,
+		},
+		RetryConfig: retry.DefaultConfig,
+	}
 	cfg = ApplyGRPCEnvConfigs(cfg)
 	for _, opt := range opts {
 		cfg = opt.ApplyGRPCOption(cfg)
diff --git a/exporters/otlp/otlpmetric/internal/otlpconfig/options_test.go b/exporters/otlp/otlpmetric/internal/otlpconfig/options_test.go
index d82802603e3..44c9af4d94c 100644
--- a/exporters/otlp/otlpmetric/internal/otlpconfig/options_test.go
+++ b/exporters/otlp/otlpmetric/internal/otlpconfig/options_test.go
@@ -76,7 +76,11 @@ func TestConfigs(t *testing.T) {
 		{
 			name: "Test default configs",
 			asserts: func(t *testing.T, c *otlpconfig.Config, grpcOption bool) {
-				assert.Equal(t, "localhost:4317", c.Metrics.Endpoint)
+				if grpcOption {
+					assert.Equal(t, "localhost:4317", c.Metrics.Endpoint)
+				} else {
+					assert.Equal(t, "localhost:4318", c.Metrics.Endpoint)
+				}
 				assert.Equal(t, otlpconfig.NoCompression, c.Metrics.Compression)
 				assert.Equal(t, map[string]string(nil), c.Metrics.Headers)
 				assert.Equal(t, 10*time.Second, c.Metrics.Timeout)
@@ -386,11 +390,7 @@ func TestConfigs(t *testing.T) {
 			t.Cleanup(func() { otlpconfig.DefaultEnvOptionsReader = origEOR })
 
 			// Tests Generic options as HTTP Options
-			cfg := otlpconfig.NewDefaultConfig()
-			cfg = otlpconfig.ApplyHTTPEnvConfigs(cfg)
-			for _, opt := range tt.opts {
-				cfg = opt.ApplyHTTPOption(cfg)
-			}
+			cfg := otlpconfig.NewHTTPConfig(asHTTPOptions(tt.opts)...)
 			tt.asserts(t, &cfg, false)
 
 			// Tests Generic options as gRPC Options
@@ -400,6 +400,14 @@ func TestConfigs(t *testing.T) {
 	}
 }
 
+func asHTTPOptions(opts []otlpconfig.GenericOption) []otlpconfig.HTTPOption {
+	converted := make([]otlpconfig.HTTPOption, len(opts))
+	for i, o := range opts {
+		converted[i] = otlpconfig.NewHTTPOption(o.ApplyHTTPOption)
+	}
+	return converted
+}
+
 func asGRPCOptions(opts []otlpconfig.GenericOption) []otlpconfig.GRPCOption {
 	converted := make([]otlpconfig.GRPCOption, len(opts))
 	for i, o := range opts {
diff --git a/exporters/otlp/otlpmetric/internal/otlpconfig/optiontypes.go b/exporters/otlp/otlpmetric/internal/otlpconfig/optiontypes.go
index beb0eb08b3b..1d6f83f366d 100644
--- a/exporters/otlp/otlpmetric/internal/otlpconfig/optiontypes.go
+++ b/exporters/otlp/otlpmetric/internal/otlpconfig/optiontypes.go
@@ -17,9 +17,10 @@ package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric
 import "time"
 
 const (
-	// DefaultCollectorPort is the port the Exporter will attempt connect to
-	// if no collector port is provided.
-	DefaultCollectorPort uint16 = 4317
+	// DefaultCollectorGRPCPort is the default gRPC port of the collector.
+	DefaultCollectorGRPCPort uint16 = 4317
+	// DefaultCollectorHTTPPort is the default HTTP port of the collector.
+	DefaultCollectorHTTPPort uint16 = 4318
 	// DefaultCollectorHost is the host address the Exporter will attempt
 	// connect to if no collector address is provided.
 	DefaultCollectorHost string = "localhost"
diff --git a/exporters/otlp/otlpmetric/internal/otlpmetrictest/otlptest.go b/exporters/otlp/otlpmetric/internal/otlpmetrictest/otlptest.go
index f7cd1937aa6..524cb774588 100644
--- a/exporters/otlp/otlpmetric/internal/otlpmetrictest/otlptest.go
+++ b/exporters/otlp/otlpmetric/internal/otlpmetrictest/otlptest.go
@@ -25,7 +25,7 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric"
-	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
 	"go.opentelemetry.io/otel/sdk/metric/number"
@@ -63,34 +63,37 @@ func RunEndToEndTest(ctx context.Context, t *testing.T, exp *otlpmetric.Exporter
 		case sdkapi.CounterInstrumentKind:
 			switch data.nKind {
 			case number.Int64Kind:
-				metric.Must(meter).NewInt64Counter(name).Add(ctx, data.val, labels...)
+				c, _ := meter.SyncInt64().Counter(name)
+				c.Add(ctx, data.val, labels...)
 			case number.Float64Kind:
-				metric.Must(meter).NewFloat64Counter(name).Add(ctx, float64(data.val), labels...)
+				c, _ := meter.SyncFloat64().Counter(name)
+				c.Add(ctx, float64(data.val), labels...)
 			default:
 				assert.Failf(t, "unsupported number testing kind", data.nKind.String())
 			}
 		case sdkapi.HistogramInstrumentKind:
 			switch data.nKind {
 			case number.Int64Kind:
-				metric.Must(meter).NewInt64Histogram(name).Record(ctx, data.val, labels...)
+				c, _ := meter.SyncInt64().Histogram(name)
+				c.Record(ctx, data.val, labels...)
 			case number.Float64Kind:
-				metric.Must(meter).NewFloat64Histogram(name).Record(ctx, float64(data.val), labels...)
+				c, _ := meter.SyncFloat64().Histogram(name)
+				c.Record(ctx, float64(data.val), labels...)
 			default:
 				assert.Failf(t, "unsupported number testing kind", data.nKind.String())
 			}
 		case sdkapi.GaugeObserverInstrumentKind:
 			switch data.nKind {
 			case number.Int64Kind:
-				metric.Must(meter).NewInt64GaugeObserver(name,
-					func(_ context.Context, result metric.Int64ObserverResult) {
-						result.Observe(data.val, labels...)
-					},
-				)
+				g, _ := meter.AsyncInt64().Gauge(name)
+				_ = meter.RegisterCallback([]instrument.Asynchronous{g}, func(ctx context.Context) {
+					g.Observe(ctx, data.val, labels...)
+				})
 			case number.Float64Kind:
-				callback := func(v float64) metric.Float64ObserverFunc {
-					return metric.Float64ObserverFunc(func(_ context.Context, result metric.Float64ObserverResult) { result.Observe(v, labels...) })
-				}(float64(data.val))
-				metric.Must(meter).NewFloat64GaugeObserver(name, callback)
+				g, _ := meter.AsyncFloat64().Gauge(name)
+				_ = meter.RegisterCallback([]instrument.Asynchronous{g}, func(ctx context.Context) {
+					g.Observe(ctx, float64(data.val), labels...)
+				})
 			default:
 				assert.Failf(t, "unsupported number testing kind", data.nKind.String())
 			}
diff --git a/exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go b/exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go
index bc979541c90..dc7eeda51d9 100644
--- a/exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go
+++ b/exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go
@@ -93,7 +93,7 @@ func newGRPCExporter(t *testing.T, ctx context.Context, endpoint string, additio
 }
 
 func newExporterEndToEndTest(t *testing.T, additionalOpts []otlpmetricgrpc.Option) {
-	mc := runMockCollectorAtEndpoint(t, "localhost:56561")
+	mc := runMockCollector(t)
 
 	defer func() {
 		_ = mc.stop()
@@ -115,7 +115,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlpmetricgrpc.Optio
 }
 
 func TestExporterShutdown(t *testing.T) {
-	mc := runMockCollectorAtEndpoint(t, "localhost:56561")
+	mc := runMockCollector(t)
 	defer func() {
 		_ = mc.Stop()
 	}()
@@ -296,7 +296,7 @@ func TestStartErrorInvalidAddress(t *testing.T) {
 }
 
 func TestEmptyData(t *testing.T) {
-	mc := runMockCollectorAtEndpoint(t, "localhost:56561")
+	mc := runMockCollector(t)
 
 	defer func() {
 		_ = mc.stop()
@@ -314,7 +314,7 @@ func TestEmptyData(t *testing.T) {
 }
 
 func TestFailedMetricTransform(t *testing.T) {
-	mc := runMockCollectorAtEndpoint(t, "localhost:56561")
+	mc := runMockCollector(t)
 
 	defer func() {
 		_ = mc.stop()
diff --git a/exporters/otlp/otlpmetric/otlpmetricgrpc/example_test.go b/exporters/otlp/otlpmetric/otlpmetricgrpc/example_test.go
index f37c39095f7..fe0866b7af5 100644
--- a/exporters/otlp/otlpmetric/otlpmetricgrpc/example_test.go
+++ b/exporters/otlp/otlpmetric/otlpmetricgrpc/example_test.go
@@ -24,8 +24,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric"
 	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
-	"go.opentelemetry.io/otel/metric"
-	"go.opentelemetry.io/otel/metric/global"
+	"go.opentelemetry.io/otel/metric/instrument"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
 	"go.opentelemetry.io/otel/sdk/metric/selector/simple"
@@ -54,7 +53,8 @@ func Example_insecure() {
 		controller.WithExporter(exp),
 		controller.WithCollectPeriod(2*time.Second),
 	)
-	global.SetMeterProvider(pusher)
+	// TODO Bring back Global package
+	// global.SetMeterProvider(pusher)
 
 	if err := pusher.Start(ctx); err != nil {
 		log.Fatalf("could not start metric controoler: %v", err)
@@ -68,14 +68,16 @@ func Example_insecure() {
 		}
 	}()
 
-	meter := global.Meter("test-meter")
+	// TODO Bring Back Global package
+	// meter := global.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
+	meter := pusher.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
 
 	// Recorder metric example
-	counter := metric.Must(meter).
-		NewFloat64Counter(
-			"an_important_metric",
-			metric.WithDescription("Measures the cumulative epicness of the app"),
-		)
+
+	counter, err := meter.SyncFloat64().Counter("an_important_metric", instrument.WithDescription("Measures the cumulative epicness of the app"))
+	if err != nil {
+		log.Fatalf("Failed to create the instrument: %v", err)
+	}
 
 	for i := 0; i < 10; i++ {
 		log.Printf("Doing really hard work (%d / 10)\n", i+1)
@@ -113,7 +115,8 @@ func Example_withTLS() {
 		controller.WithExporter(exp),
 		controller.WithCollectPeriod(2*time.Second),
 	)
-	global.SetMeterProvider(pusher)
+	// TODO Bring back Global package
+	// global.SetMeterProvider(pusher)
 
 	if err := pusher.Start(ctx); err != nil {
 		log.Fatalf("could not start metric controoler: %v", err)
@@ -128,14 +131,15 @@ func Example_withTLS() {
 		}
 	}()
 
-	meter := global.Meter("test-meter")
+	// TODO Bring back Global package
+	// meter := global.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
+	meter := pusher.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
 
 	// Recorder metric example
-	counter := metric.Must(meter).
-		NewFloat64Counter(
-			"an_important_metric",
-			metric.WithDescription("Measures the cumulative epicness of the app"),
-		)
+	counter, err := meter.SyncFloat64().Counter("an_important_metric", instrument.WithDescription("Measures the cumulative epicness of the app"))
+	if err != nil {
+		log.Fatalf("Failed to create the instrument: %v", err)
+	}
 
 	for i := 0; i < 10; i++ {
 		log.Printf("Doing really hard work (%d / 10)\n", i+1)
@@ -170,7 +174,8 @@ func Example_withDifferentSignalCollectors() {
 		controller.WithExporter(exp),
 		controller.WithCollectPeriod(2*time.Second),
 	)
-	global.SetMeterProvider(pusher)
+	// TODO Bring back Global package
+	// global.SetMeterProvider(pusher)
 
 	if err := pusher.Start(ctx); err != nil {
 		log.Fatalf("could not start metric controoler: %v", err)
@@ -184,14 +189,15 @@ func Example_withDifferentSignalCollectors() {
 		}
 	}()
 
-	meter := global.Meter("test-meter")
+	// TODO Bring back Global package
+	// meter := global.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
+	meter := pusher.Meter("go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc_test")
 
 	// Recorder metric example
-	counter := metric.Must(meter).
-		NewFloat64Counter(
-			"an_important_metric",
-			metric.WithDescription("Measures the cumulative epicness of the app"),
-		)
+	counter, err := meter.SyncFloat64().Counter("an_important_metric", instrument.WithDescription("Measures the cumulative epicness of the app"))
+	if err != nil {
+		log.Fatalf("Failed to create the instrument: %v", err)
+	}
 
 	for i := 0; i < 10; i++ {
 		log.Printf("Doing really hard work (%d / 10)\n", i+1)
diff --git a/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod b/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
index 11fe57e8a7c..cba505c7944 100644
--- a/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
+++ b/exporters/otlp/otlpmetric/otlpmetricgrpc/go.mod
@@ -4,12 +4,12 @@ go 1.16
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.26.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.27.0
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 	go.opentelemetry.io/proto/otlp v0.12.0
 	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
 	google.golang.org/grpc v1.44.0
@@ -42,8 +42,6 @@ replace go.opentelemetry.io/otel/example/otel-collector => ../../../../example/o
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../../../example/passthrough
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../../example/zipkin
diff --git a/exporters/otlp/otlpmetric/otlpmetrichttp/client.go b/exporters/otlp/otlpmetric/otlpmetrichttp/client.go
index aa381f8e038..dab28ff8fb2 100644
--- a/exporters/otlp/otlpmetric/otlpmetrichttp/client.go
+++ b/exporters/otlp/otlpmetric/otlpmetrichttp/client.go
@@ -24,9 +24,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"path"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -77,26 +75,7 @@ type client struct {
 
 // NewClient creates a new HTTP metric client.
 func NewClient(opts ...Option) otlpmetric.Client {
-	cfg := otlpconfig.NewDefaultConfig()
-	cfg = otlpconfig.ApplyHTTPEnvConfigs(cfg)
-	for _, opt := range opts {
-		cfg = opt.applyHTTPOption(cfg)
-	}
-
-	for pathPtr, defaultPath := range map[*string]string{
-		&cfg.Metrics.URLPath: otlpconfig.DefaultMetricsPath,
-	} {
-		tmp := strings.TrimSpace(*pathPtr)
-		if tmp == "" {
-			tmp = defaultPath
-		} else {
-			tmp = path.Clean(tmp)
-			if !path.IsAbs(tmp) {
-				tmp = fmt.Sprintf("/%s", tmp)
-			}
-		}
-		*pathPtr = tmp
-	}
+	cfg := otlpconfig.NewHTTPConfig(asHTTPOptions(opts)...)
 
 	httpClient := &http.Client{
 		Transport: ourTransport,
diff --git a/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod b/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
index 810db0a898c..a91939eff01 100644
--- a/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
+++ b/exporters/otlp/otlpmetric/otlpmetrichttp/go.mod
@@ -4,9 +4,9 @@ go 1.16
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
 	go.opentelemetry.io/proto/otlp v0.12.0
 	google.golang.org/protobuf v1.27.1
 )
@@ -37,14 +37,10 @@ replace go.opentelemetry.io/otel/example/otel-collector => ../../../../example/o
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../../../example/passthrough
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../../example/zipkin
 
-replace go.opentelemetry.io/otel/exporters/metric/prometheus => ../../../metric/prometheus
-
 replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp => ./
 
 replace go.opentelemetry.io/otel/exporters/otlp/otlptrace => ../../otlptrace
@@ -53,10 +49,6 @@ replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc => ../..
 
 replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp => ../../otlptrace/otlptracehttp
 
-replace go.opentelemetry.io/otel/exporters/trace/jaeger => ../../../trace/jaeger
-
-replace go.opentelemetry.io/otel/exporters/trace/zipkin => ../../../trace/zipkin
-
 replace go.opentelemetry.io/otel/internal/tools => ../../../../internal/tools
 
 replace go.opentelemetry.io/otel/sdk/export/metric => ../../../../sdk/export/metric
diff --git a/exporters/otlp/otlpmetric/otlpmetrichttp/options.go b/exporters/otlp/otlpmetric/otlpmetrichttp/options.go
index bec26204c74..8d12c791954 100644
--- a/exporters/otlp/otlpmetric/otlpmetrichttp/options.go
+++ b/exporters/otlp/otlpmetric/otlpmetrichttp/options.go
@@ -40,6 +40,14 @@ type Option interface {
 	applyHTTPOption(otlpconfig.Config) otlpconfig.Config
 }
 
+func asHTTPOptions(opts []Option) []otlpconfig.HTTPOption {
+	converted := make([]otlpconfig.HTTPOption, len(opts))
+	for i, o := range opts {
+		converted[i] = otlpconfig.NewHTTPOption(o.applyHTTPOption)
+	}
+	return converted
+}
+
 // RetryConfig defines configuration for retrying batches in case of export
 // failure using an exponential backoff.
 type RetryConfig retry.Config
@@ -52,11 +60,10 @@ func (w wrappedOption) applyHTTPOption(cfg otlpconfig.Config) otlpconfig.Config
 	return w.ApplyHTTPOption(cfg)
 }
 
-// WithEndpoint allows one to set the address of the collector
-// endpoint that the driver will use to send metrics. If
-// unset, it will instead try to use
-// the default endpoint (localhost:4317). Note that the endpoint
-// must not contain any URL path.
+// WithEndpoint allows one to set the address of the collector endpoint that
+// the driver will use to send metrics. If unset, it will instead try to use
+// the default endpoint (localhost:4318). Note that the endpoint must not
+// contain any URL path.
 func WithEndpoint(endpoint string) Option {
 	return wrappedOption{otlpconfig.WithEndpoint(endpoint)}
 }
diff --git a/exporters/otlp/otlptrace/README.md b/exporters/otlp/otlptrace/README.md
index 8a40a86a246..ca91fd4f489 100644
--- a/exporters/otlp/otlptrace/README.md
+++ b/exporters/otlp/otlptrace/README.md
@@ -38,12 +38,14 @@ override the default configuration. For more information about how each of
 these environment variables is interpreted, see [the OpenTelemetry
 specification](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.8.0/specification/protocol/exporter.md).
 
-| Environment variable                                                     | Option                        | Default value                       |
-| ------------------------------------------------------------------------ |------------------------------ | ----------------------------------- |
-| `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`       | `WithEndpoint` `WithInsecure` | `https://localhost:4317`            |
-| `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE` | `WithTLSClientConfig`         |                                     |
-| `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_TRACES_HEADERS`         | `WithHeaders`                 |                                     |
-| `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION` | `WithCompression`             |                                     |
-| `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT`         | `WithTimeout`                 | `10s`                               |
+| Environment variable                                                     | Option                        | Default value                                            |
+| ------------------------------------------------------------------------ |------------------------------ | -------------------------------------------------------- |
+| `OTEL_EXPORTER_OTLP_ENDPOINT` `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`       | `WithEndpoint` `WithInsecure` | `https://localhost:4317` or `https://localhost:4318`[^1] |
+| `OTEL_EXPORTER_OTLP_CERTIFICATE` `OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE` | `WithTLSClientConfig`         |                                                          |
+| `OTEL_EXPORTER_OTLP_HEADERS` `OTEL_EXPORTER_OTLP_TRACES_HEADERS`         | `WithHeaders`                 |                                                          |
+| `OTEL_EXPORTER_OTLP_COMPRESSION` `OTEL_EXPORTER_OTLP_TRACES_COMPRESSION` | `WithCompression`             |                                                          |
+| `OTEL_EXPORTER_OTLP_TIMEOUT` `OTEL_EXPORTER_OTLP_TRACES_TIMEOUT`         | `WithTimeout`                 | `10s`                                                    |
+
+[^1]: The gRPC client defaults to `https://localhost:4317` and the HTTP client `https://localhost:4318`.
 
 Configuration using options have precedence over the environment variables.
diff --git a/exporters/otlp/otlptrace/exporter.go b/exporters/otlp/otlptrace/exporter.go
index 7e9bb6c47ae..c5ee6c098cc 100644
--- a/exporters/otlp/otlptrace/exporter.go
+++ b/exporters/otlp/otlptrace/exporter.go
@@ -100,3 +100,14 @@ func NewUnstarted(client Client) *Exporter {
 		client: client,
 	}
 }
+
+// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+func (e *Exporter) MarshalLog() interface{} {
+	return struct {
+		Type   string
+		Client Client
+	}{
+		Type:   "otlptrace",
+		Client: e.client,
+	}
+}
diff --git a/exporters/otlp/otlptrace/go.mod b/exporters/otlp/otlptrace/go.mod
index ddc8f8a5ed8..dd9eb1815aa 100644
--- a/exporters/otlp/otlptrace/go.mod
+++ b/exporters/otlp/otlptrace/go.mod
@@ -5,10 +5,10 @@ go 1.16
 require (
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 	go.opentelemetry.io/proto/otlp v0.12.0
 	google.golang.org/grpc v1.44.0
 	google.golang.org/protobuf v1.27.1
@@ -34,8 +34,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../../example/opencens
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../example/zipkin
diff --git a/exporters/otlp/otlptrace/internal/otlpconfig/options.go b/exporters/otlp/otlptrace/internal/otlpconfig/options.go
index e6fb14e00e8..56e83b85334 100644
--- a/exporters/otlp/otlptrace/internal/otlpconfig/options.go
+++ b/exporters/otlp/otlptrace/internal/otlpconfig/options.go
@@ -25,6 +25,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/encoding/gzip"
 
+	"go.opentelemetry.io/otel/exporters/otlp/internal"
 	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
 )
 
@@ -65,24 +66,38 @@ type (
 	}
 )
 
-func NewDefaultConfig() Config {
-	c := Config{
+// NewHTTPConfig returns a new Config with all settings applied from opts and
+// any unset setting using the default HTTP config values.
+func NewHTTPConfig(opts ...HTTPOption) Config {
+	cfg := Config{
 		Traces: SignalConfig{
-			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorPort),
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorHTTPPort),
 			URLPath:     DefaultTracesPath,
 			Compression: NoCompression,
 			Timeout:     DefaultTimeout,
 		},
 		RetryConfig: retry.DefaultConfig,
 	}
-
-	return c
+	cfg = ApplyHTTPEnvConfigs(cfg)
+	for _, opt := range opts {
+		cfg = opt.ApplyHTTPOption(cfg)
+	}
+	cfg.Traces.URLPath = internal.CleanPath(cfg.Traces.URLPath, DefaultTracesPath)
+	return cfg
 }
 
 // NewGRPCConfig returns a new Config with all settings applied from opts and
 // any unset setting using the default gRPC config values.
 func NewGRPCConfig(opts ...GRPCOption) Config {
-	cfg := NewDefaultConfig()
+	cfg := Config{
+		Traces: SignalConfig{
+			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorGRPCPort),
+			URLPath:     DefaultTracesPath,
+			Compression: NoCompression,
+			Timeout:     DefaultTimeout,
+		},
+		RetryConfig: retry.DefaultConfig,
+	}
 	cfg = ApplyGRPCEnvConfigs(cfg)
 	for _, opt := range opts {
 		cfg = opt.ApplyGRPCOption(cfg)
diff --git a/exporters/otlp/otlptrace/internal/otlpconfig/options_test.go b/exporters/otlp/otlptrace/internal/otlpconfig/options_test.go
index b12e0bd9a5c..4efa2f7c630 100644
--- a/exporters/otlp/otlptrace/internal/otlpconfig/options_test.go
+++ b/exporters/otlp/otlptrace/internal/otlpconfig/options_test.go
@@ -76,7 +76,11 @@ func TestConfigs(t *testing.T) {
 		{
 			name: "Test default configs",
 			asserts: func(t *testing.T, c *otlpconfig.Config, grpcOption bool) {
-				assert.Equal(t, "localhost:4317", c.Traces.Endpoint)
+				if grpcOption {
+					assert.Equal(t, "localhost:4317", c.Traces.Endpoint)
+				} else {
+					assert.Equal(t, "localhost:4318", c.Traces.Endpoint)
+				}
 				assert.Equal(t, otlpconfig.NoCompression, c.Traces.Compression)
 				assert.Equal(t, map[string]string(nil), c.Traces.Headers)
 				assert.Equal(t, 10*time.Second, c.Traces.Timeout)
@@ -384,11 +388,7 @@ func TestConfigs(t *testing.T) {
 			t.Cleanup(func() { otlpconfig.DefaultEnvOptionsReader = origEOR })
 
 			// Tests Generic options as HTTP Options
-			cfg := otlpconfig.NewDefaultConfig()
-			cfg = otlpconfig.ApplyHTTPEnvConfigs(cfg)
-			for _, opt := range tt.opts {
-				cfg = opt.ApplyHTTPOption(cfg)
-			}
+			cfg := otlpconfig.NewHTTPConfig(asHTTPOptions(tt.opts)...)
 			tt.asserts(t, &cfg, false)
 
 			// Tests Generic options as gRPC Options
@@ -398,6 +398,14 @@ func TestConfigs(t *testing.T) {
 	}
 }
 
+func asHTTPOptions(opts []otlpconfig.GenericOption) []otlpconfig.HTTPOption {
+	converted := make([]otlpconfig.HTTPOption, len(opts))
+	for i, o := range opts {
+		converted[i] = otlpconfig.NewHTTPOption(o.ApplyHTTPOption)
+	}
+	return converted
+}
+
 func asGRPCOptions(opts []otlpconfig.GenericOption) []otlpconfig.GRPCOption {
 	converted := make([]otlpconfig.GRPCOption, len(opts))
 	for i, o := range opts {
diff --git a/exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go b/exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go
index f69e31095d2..d4331e8749f 100644
--- a/exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go
+++ b/exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go
@@ -15,9 +15,10 @@
 package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
 
 const (
-	// DefaultCollectorPort is the port the Exporter will attempt connect to
-	// if no collector port is provided.
-	DefaultCollectorPort uint16 = 4317
+	// DefaultCollectorGRPCPort is the default gRPC port of the collector.
+	DefaultCollectorGRPCPort uint16 = 4317
+	// DefaultCollectorHTTPPort is the default HTTP port of the collector.
+	DefaultCollectorHTTPPort uint16 = 4318
 	// DefaultCollectorHost is the host address the Exporter will attempt
 	// connect to if no collector address is provided.
 	DefaultCollectorHost string = "localhost"
diff --git a/exporters/otlp/otlptrace/internal/tracetransform/span.go b/exporters/otlp/otlptrace/internal/tracetransform/span.go
index 2f0f5eacb77..88c05912f0d 100644
--- a/exporters/otlp/otlptrace/internal/tracetransform/span.go
+++ b/exporters/otlp/otlptrace/internal/tracetransform/span.go
@@ -23,10 +23,6 @@ import (
 	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
 )
 
-const (
-	maxEventsPerSpan = 128
-)
-
 // Spans transforms a slice of OpenTelemetry spans into a slice of OTLP
 // ResourceSpans.
 func Spans(sdl []tracesdk.ReadOnlySpan) []*tracepb.ResourceSpans {
@@ -162,9 +158,10 @@ func links(links []tracesdk.Link) []*tracepb.Span_Link {
 		sid := otLink.SpanContext.SpanID()
 
 		sl = append(sl, &tracepb.Span_Link{
-			TraceId:    tid[:],
-			SpanId:     sid[:],
-			Attributes: KeyValues(otLink.Attributes),
+			TraceId:                tid[:],
+			SpanId:                 sid[:],
+			Attributes:             KeyValues(otLink.Attributes),
+			DroppedAttributesCount: uint32(otLink.DroppedAttributeCount),
 		})
 	}
 	return sl
@@ -176,29 +173,16 @@ func spanEvents(es []tracesdk.Event) []*tracepb.Span_Event {
 		return nil
 	}
 
-	evCount := len(es)
-	if evCount > maxEventsPerSpan {
-		evCount = maxEventsPerSpan
-	}
-	events := make([]*tracepb.Span_Event, 0, evCount)
-	nEvents := 0
-
+	events := make([]*tracepb.Span_Event, len(es))
 	// Transform message events
-	for _, e := range es {
-		if nEvents >= maxEventsPerSpan {
-			break
+	for i := 0; i < len(es); i++ {
+		events[i] = &tracepb.Span_Event{
+			Name:                   es[i].Name,
+			TimeUnixNano:           uint64(es[i].Time.UnixNano()),
+			Attributes:             KeyValues(es[i].Attributes),
+			DroppedAttributesCount: uint32(es[i].DroppedAttributeCount),
 		}
-		nEvents++
-		events = append(events,
-			&tracepb.Span_Event{
-				Name:         e.Name,
-				TimeUnixNano: uint64(e.Time.UnixNano()),
-				Attributes:   KeyValues(e.Attributes),
-				// TODO (rghetia) : Add Drop Counts when supported.
-			},
-		)
 	}
-
 	return events
 }
 
diff --git a/exporters/otlp/otlptrace/internal/tracetransform/span_test.go b/exporters/otlp/otlptrace/internal/tracetransform/span_test.go
index 351de0367ef..37860d2e047 100644
--- a/exporters/otlp/otlptrace/internal/tracetransform/span_test.go
+++ b/exporters/otlp/otlptrace/internal/tracetransform/span_test.go
@@ -15,7 +15,6 @@
 package tracetransform
 
 import (
-	"strconv"
 	"testing"
 	"time"
 
@@ -87,9 +86,10 @@ func TestSpanEvent(t *testing.T) {
 			Time:       eventTime,
 		},
 		{
-			Name:       "test 2",
-			Attributes: attrs,
-			Time:       eventTime,
+			Name:                  "test 2",
+			Attributes:            attrs,
+			Time:                  eventTime,
+			DroppedAttributeCount: 2,
 		},
 	})
 	if !assert.Len(t, got, 2) {
@@ -98,19 +98,7 @@ func TestSpanEvent(t *testing.T) {
 	eventTimestamp := uint64(1589932800 * 1e9)
 	assert.Equal(t, &tracepb.Span_Event{Name: "test 1", Attributes: nil, TimeUnixNano: eventTimestamp}, got[0])
 	// Do not test Attributes directly, just that the return value goes to the correct field.
-	assert.Equal(t, &tracepb.Span_Event{Name: "test 2", Attributes: KeyValues(attrs), TimeUnixNano: eventTimestamp}, got[1])
-}
-
-func TestExcessiveSpanEvents(t *testing.T) {
-	e := make([]tracesdk.Event, maxEventsPerSpan+1)
-	for i := 0; i < maxEventsPerSpan+1; i++ {
-		e[i] = tracesdk.Event{Name: strconv.Itoa(i)}
-	}
-	assert.Len(t, e, maxEventsPerSpan+1)
-	got := spanEvents(e)
-	assert.Len(t, got, maxEventsPerSpan)
-	// Ensure the drop order.
-	assert.Equal(t, strconv.Itoa(maxEventsPerSpan-1), got[len(got)-1].Name)
+	assert.Equal(t, &tracepb.Span_Event{Name: "test 2", Attributes: KeyValues(attrs), TimeUnixNano: eventTimestamp, DroppedAttributesCount: 2}, got[1])
 }
 
 func TestNilLinks(t *testing.T) {
@@ -124,10 +112,13 @@ func TestEmptyLinks(t *testing.T) {
 func TestLinks(t *testing.T) {
 	attrs := []attribute.KeyValue{attribute.Int("one", 1), attribute.Int("two", 2)}
 	l := []tracesdk.Link{
-		{},
 		{
-			SpanContext: trace.SpanContext{},
-			Attributes:  attrs,
+			DroppedAttributeCount: 3,
+		},
+		{
+			SpanContext:           trace.SpanContext{},
+			Attributes:            attrs,
+			DroppedAttributeCount: 3,
 		},
 	}
 	got := links(l)
@@ -139,8 +130,9 @@ func TestLinks(t *testing.T) {
 
 	// Empty should be empty.
 	expected := &tracepb.Span_Link{
-		TraceId: []uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
-		SpanId:  []uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+		TraceId:                []uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+		SpanId:                 []uint8{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},
+		DroppedAttributesCount: 3,
 	}
 	assert.Equal(t, expected, got[0])
 
@@ -151,6 +143,7 @@ func TestLinks(t *testing.T) {
 	// Changes to our links should not change the produced links.
 	l[1].SpanContext = l[1].SpanContext.WithTraceID(trace.TraceID{})
 	assert.Equal(t, expected, got[1])
+	assert.Equal(t, l[1].DroppedAttributeCount, int(got[1].DroppedAttributesCount))
 }
 
 func TestStatus(t *testing.T) {
diff --git a/exporters/otlp/otlptrace/otlptracegrpc/client.go b/exporters/otlp/otlptrace/otlptracegrpc/client.go
index d709ffa96e1..31ed8190b67 100644
--- a/exporters/otlp/otlptrace/otlptracegrpc/client.go
+++ b/exporters/otlp/otlptrace/otlptracegrpc/client.go
@@ -273,3 +273,14 @@ func throttleDelay(status *status.Status) time.Duration {
 	}
 	return 0
 }
+
+// MarshalLog is the marshaling function used by the logging system to represent this Client.
+func (c *client) MarshalLog() interface{} {
+	return struct {
+		Type     string
+		Endpoint string
+	}{
+		Type:     "otlphttpgrpc",
+		Endpoint: c.endpoint,
+	}
+}
diff --git a/exporters/otlp/otlptrace/otlptracegrpc/client_test.go b/exporters/otlp/otlptrace/otlptracegrpc/client_test.go
index 9a02ca227b6..191ff23afd4 100644
--- a/exporters/otlp/otlptrace/otlptracegrpc/client_test.go
+++ b/exporters/otlp/otlptrace/otlptracegrpc/client_test.go
@@ -374,7 +374,7 @@ func TestStartErrorInvalidAddress(t *testing.T) {
 }
 
 func TestEmptyData(t *testing.T) {
-	mc := runMockCollectorAtEndpoint(t, "localhost:56561")
+	mc := runMockCollector(t)
 	t.Cleanup(func() { require.NoError(t, mc.stop()) })
 
 	<-time.After(5 * time.Millisecond)
diff --git a/exporters/otlp/otlptrace/otlptracegrpc/go.mod b/exporters/otlp/otlptrace/otlptracegrpc/go.mod
index 7324309e2d9..024bd30407c 100644
--- a/exporters/otlp/otlptrace/otlptracegrpc/go.mod
+++ b/exporters/otlp/otlptrace/otlptracegrpc/go.mod
@@ -4,10 +4,10 @@ go 1.16
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
 	go.opentelemetry.io/proto/otlp v0.12.0
 	go.uber.org/goleak v1.1.12
 	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
@@ -37,8 +37,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../../../example/openc
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../../example/zipkin
diff --git a/exporters/otlp/otlptrace/otlptracehttp/client.go b/exporters/otlp/otlptrace/otlptracehttp/client.go
index 81487f9b6f9..9a1428b444c 100644
--- a/exporters/otlp/otlptrace/otlptracehttp/client.go
+++ b/exporters/otlp/otlptrace/otlptracehttp/client.go
@@ -24,9 +24,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"path"
 	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -79,26 +77,7 @@ var _ otlptrace.Client = (*client)(nil)
 
 // NewClient creates a new HTTP trace client.
 func NewClient(opts ...Option) otlptrace.Client {
-	cfg := otlpconfig.NewDefaultConfig()
-	cfg = otlpconfig.ApplyHTTPEnvConfigs(cfg)
-	for _, opt := range opts {
-		cfg = opt.applyHTTPOption(cfg)
-	}
-
-	for pathPtr, defaultPath := range map[*string]string{
-		&cfg.Traces.URLPath: otlpconfig.DefaultTracesPath,
-	} {
-		tmp := strings.TrimSpace(*pathPtr)
-		if tmp == "" {
-			tmp = defaultPath
-		} else {
-			tmp = path.Clean(tmp)
-			if !path.IsAbs(tmp) {
-				tmp = fmt.Sprintf("/%s", tmp)
-			}
-		}
-		*pathPtr = tmp
-	}
+	cfg := otlpconfig.NewHTTPConfig(asHTTPOptions(opts)...)
 
 	httpClient := &http.Client{
 		Transport: ourTransport,
@@ -243,6 +222,19 @@ func (d *client) newRequest(body []byte) (request, error) {
 	return req, nil
 }
 
+// MarshalLog is the marshaling function used by the logging system to represent this Client.
+func (d *client) MarshalLog() interface{} {
+	return struct {
+		Type     string
+		Endpoint string
+		Insecure bool
+	}{
+		Type:     "otlphttphttp",
+		Endpoint: d.cfg.Endpoint,
+		Insecure: d.cfg.Insecure,
+	}
+}
+
 // bodyReader returns a closure returning a new reader for buf.
 func bodyReader(buf []byte) func() io.ReadCloser {
 	return func() io.ReadCloser {
diff --git a/exporters/otlp/otlptrace/otlptracehttp/go.mod b/exporters/otlp/otlptrace/otlptracehttp/go.mod
index 5c3486dc0c4..fb3ca1c3429 100644
--- a/exporters/otlp/otlptrace/otlptracehttp/go.mod
+++ b/exporters/otlp/otlptrace/otlptracehttp/go.mod
@@ -4,11 +4,11 @@ go 1.16
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.4.1
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 	go.opentelemetry.io/proto/otlp v0.12.0
 	google.golang.org/protobuf v1.27.1
 )
@@ -31,8 +31,6 @@ replace go.opentelemetry.io/otel/example/otel-collector => ../../../../example/o
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../../../example/passthrough
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../../example/zipkin
diff --git a/exporters/otlp/otlptrace/otlptracehttp/options.go b/exporters/otlp/otlptrace/otlptracehttp/options.go
index e550cfb5d51..4257ce3473f 100644
--- a/exporters/otlp/otlptrace/otlptracehttp/options.go
+++ b/exporters/otlp/otlptrace/otlptracehttp/options.go
@@ -40,6 +40,14 @@ type Option interface {
 	applyHTTPOption(otlpconfig.Config) otlpconfig.Config
 }
 
+func asHTTPOptions(opts []Option) []otlpconfig.HTTPOption {
+	converted := make([]otlpconfig.HTTPOption, len(opts))
+	for i, o := range opts {
+		converted[i] = otlpconfig.NewHTTPOption(o.applyHTTPOption)
+	}
+	return converted
+}
+
 // RetryConfig defines configuration for retrying batches in case of export
 // failure using an exponential backoff.
 type RetryConfig retry.Config
@@ -55,7 +63,7 @@ func (w wrappedOption) applyHTTPOption(cfg otlpconfig.Config) otlpconfig.Config
 // WithEndpoint allows one to set the address of the collector
 // endpoint that the driver will use to send spans. If
 // unset, it will instead try to use
-// the default endpoint (localhost:4317). Note that the endpoint
+// the default endpoint (localhost:4318). Note that the endpoint
 // must not contain any URL path.
 func WithEndpoint(endpoint string) Option {
 	return wrappedOption{otlpconfig.WithEndpoint(endpoint)}
diff --git a/exporters/prometheus/go.mod b/exporters/prometheus/go.mod
index bfdbb4ab561..3d02af45d5f 100644
--- a/exporters/prometheus/go.mod
+++ b/exporters/prometheus/go.mod
@@ -5,10 +5,10 @@ go 1.16
 require (
 	github.com/prometheus/client_golang v1.12.1
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 )
 
 replace go.opentelemetry.io/otel => ../..
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-co
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../example/passthrough
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
diff --git a/exporters/prometheus/prometheus_test.go b/exporters/prometheus/prometheus_test.go
index b05d9232117..587c8633e78 100644
--- a/exporters/prometheus/prometheus_test.go
+++ b/exporters/prometheus/prometheus_test.go
@@ -26,7 +26,7 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/exporters/prometheus"
-	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/sdk/metric/aggregator/histogram"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
@@ -107,9 +107,12 @@ func TestPrometheusExporter(t *testing.T) {
 	require.NoError(t, err)
 
 	meter := exporter.MeterProvider().Meter("test")
-	upDownCounter := metric.Must(meter).NewFloat64UpDownCounter("updowncounter")
-	counter := metric.Must(meter).NewFloat64Counter("counter")
-	histogram := metric.Must(meter).NewFloat64Histogram("histogram")
+	upDownCounter, err := meter.SyncFloat64().UpDownCounter("updowncounter")
+	require.NoError(t, err)
+	counter, err := meter.SyncFloat64().Counter("counter")
+	require.NoError(t, err)
+	histogram, err := meter.SyncFloat64().Histogram("histogram")
+	require.NoError(t, err)
 
 	labels := []attribute.KeyValue{
 		attribute.Key("A").String("B"),
@@ -124,9 +127,13 @@ func TestPrometheusExporter(t *testing.T) {
 
 	expected = append(expected, expectCounter("counter", `counter{A="B",C="D",R="V"} 15.3`))
 
-	_ = metric.Must(meter).NewInt64GaugeObserver("intgaugeobserver", func(_ context.Context, result metric.Int64ObserverResult) {
-		result.Observe(1, labels...)
+	gaugeObserver, err := meter.AsyncInt64().Gauge("intgaugeobserver")
+	require.NoError(t, err)
+
+	err = meter.RegisterCallback([]instrument.Asynchronous{gaugeObserver}, func(ctx context.Context) {
+		gaugeObserver.Observe(ctx, 1, labels...)
 	})
+	require.NoError(t, err)
 
 	expected = append(expected, expectGauge("intgaugeobserver", `intgaugeobserver{A="B",C="D",R="V"} 1`))
 
@@ -148,15 +155,23 @@ func TestPrometheusExporter(t *testing.T) {
 
 	expected = append(expected, expectGauge("updowncounter", `updowncounter{A="B",C="D",R="V"} 6.8`))
 
-	_ = metric.Must(meter).NewFloat64CounterObserver("floatcounterobserver", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(7.7, labels...)
+	counterObserver, err := meter.AsyncFloat64().Counter("floatcounterobserver")
+	require.NoError(t, err)
+
+	err = meter.RegisterCallback([]instrument.Asynchronous{counterObserver}, func(ctx context.Context) {
+		counterObserver.Observe(ctx, 7.7, labels...)
 	})
+	require.NoError(t, err)
 
 	expected = append(expected, expectCounter("floatcounterobserver", `floatcounterobserver{A="B",C="D",R="V"} 7.7`))
 
-	_ = metric.Must(meter).NewFloat64UpDownCounterObserver("floatupdowncounterobserver", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(-7.7, labels...)
+	upDownCounterObserver, err := meter.AsyncFloat64().UpDownCounter("floatupdowncounterobserver")
+	require.NoError(t, err)
+
+	err = meter.RegisterCallback([]instrument.Asynchronous{upDownCounterObserver}, func(ctx context.Context) {
+		upDownCounterObserver.Observe(ctx, -7.7, labels...)
 	})
+	require.NoError(t, err)
 
 	expected = append(expected, expectGauge("floatupdowncounterobserver", `floatupdowncounterobserver{A="B",C="D",R="V"} -7.7`))
 
@@ -196,10 +211,8 @@ func TestPrometheusStatefulness(t *testing.T) {
 
 	ctx := context.Background()
 
-	counter := metric.Must(meter).NewInt64Counter(
-		"a.counter",
-		metric.WithDescription("Counts things"),
-	)
+	counter, err := meter.SyncInt64().Counter("a.counter", instrument.WithDescription("Counts things"))
+	require.NoError(t, err)
 
 	counter.Add(ctx, 100, attribute.String("key", "value"))
 
diff --git a/exporters/stdout/stdoutmetric/example_test.go b/exporters/stdout/stdoutmetric/example_test.go
index c367b767040..1250a463a8c 100644
--- a/exporters/stdout/stdoutmetric/example_test.go
+++ b/exporters/stdout/stdoutmetric/example_test.go
@@ -21,7 +21,7 @@ import (
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
 	"go.opentelemetry.io/otel/metric"
-	"go.opentelemetry.io/otel/metric/global"
+	"go.opentelemetry.io/otel/metric/instrument/syncint64"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
 	"go.opentelemetry.io/otel/sdk/metric/selector/simple"
@@ -33,13 +33,15 @@ const (
 )
 
 var (
-	meter = global.GetMeterProvider().Meter(
-		instrumentationName,
-		metric.WithInstrumentationVersion(instrumentationVersion),
-	)
+	// TODO Bring back Global package
+	// meter = global.GetMeterProvider().Meter(
+	// 	instrumentationName,
+	// 	metric.WithInstrumentationVersion(instrumentationVersion),
+	// )
+	meter metric.Meter
 
-	loopCounter = metric.Must(meter).NewInt64Counter("function.loops")
-	paramValue  = metric.Must(meter).NewInt64Histogram("function.param")
+	loopCounter syncint64.Counter
+	paramValue  syncint64.Histogram
 
 	nameKey = attribute.Key("function.name")
 )
@@ -80,7 +82,18 @@ func InstallExportPipeline(ctx context.Context) func() {
 	if err = pusher.Start(ctx); err != nil {
 		log.Fatalf("starting push controller: %v", err)
 	}
-	global.SetMeterProvider(pusher)
+	// TODO Bring back Global package
+	// global.SetMeterProvider(pusher)
+	meter = pusher.Meter(instrumentationName, metric.WithInstrumentationVersion(instrumentationVersion))
+
+	loopCounter, err = meter.SyncInt64().Counter("function.loops")
+	if err != nil {
+		log.Fatalf("creating instrument: %v", err)
+	}
+	paramValue, err = meter.SyncInt64().Histogram("function.param")
+	if err != nil {
+		log.Fatalf("creating instrument: %v", err)
+	}
 
 	return func() {
 		if err := pusher.Stop(ctx); err != nil {
@@ -92,7 +105,7 @@ func InstallExportPipeline(ctx context.Context) func() {
 func Example() {
 	ctx := context.Background()
 
-	// Registers a meter Provider globally.
+	// TODO: Registers a meter Provider globally.
 	cleanup := InstallExportPipeline(ctx)
 	defer cleanup()
 
diff --git a/exporters/stdout/stdoutmetric/go.mod b/exporters/stdout/stdoutmetric/go.mod
index c438a6f0037..07989e72e67 100644
--- a/exporters/stdout/stdoutmetric/go.mod
+++ b/exporters/stdout/stdoutmetric/go.mod
@@ -9,10 +9,10 @@ replace (
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/sdk/metric v0.26.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../../bridge/opencensus
@@ -27,8 +27,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../../example/opencens
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../example/zipkin
diff --git a/exporters/stdout/stdoutmetric/metric_test.go b/exporters/stdout/stdoutmetric/metric_test.go
index e9153fcfd0a..33e2831dbd7 100644
--- a/exporters/stdout/stdoutmetric/metric_test.go
+++ b/exporters/stdout/stdoutmetric/metric_test.go
@@ -101,7 +101,8 @@ func TestStdoutTimestamp(t *testing.T) {
 
 	require.NoError(t, cont.Start(ctx))
 	meter := cont.Meter("test")
-	counter := metric.Must(meter).NewInt64Counter("name.lastvalue")
+	counter, err := meter.SyncInt64().Counter("name.lastvalue")
+	require.NoError(t, err)
 
 	before := time.Now()
 	// Ensure the timestamp is after before.
@@ -137,7 +138,8 @@ func TestStdoutTimestamp(t *testing.T) {
 func TestStdoutCounterFormat(t *testing.T) {
 	fix := newFixture(t)
 
-	counter := metric.Must(fix.meter).NewInt64Counter("name.sum")
+	counter, err := fix.meter.SyncInt64().Counter("name.sum")
+	require.NoError(t, err)
 	counter.Add(fix.ctx, 123, attribute.String("A", "B"), attribute.String("C", "D"))
 
 	require.NoError(t, fix.cont.Stop(fix.ctx))
@@ -148,7 +150,8 @@ func TestStdoutCounterFormat(t *testing.T) {
 func TestStdoutLastValueFormat(t *testing.T) {
 	fix := newFixture(t)
 
-	counter := metric.Must(fix.meter).NewFloat64Counter("name.lastvalue")
+	counter, err := fix.meter.SyncFloat64().Counter("name.lastvalue")
+	require.NoError(t, err)
 	counter.Add(fix.ctx, 123.456, attribute.String("A", "B"), attribute.String("C", "D"))
 
 	require.NoError(t, fix.cont.Stop(fix.ctx))
@@ -159,7 +162,8 @@ func TestStdoutLastValueFormat(t *testing.T) {
 func TestStdoutHistogramFormat(t *testing.T) {
 	fix := newFixture(t, stdoutmetric.WithPrettyPrint())
 
-	inst := metric.Must(fix.meter).NewFloat64Histogram("name.histogram")
+	inst, err := fix.meter.SyncFloat64().Histogram("name.histogram")
+	require.NoError(t, err)
 
 	for i := 0; i < 1000; i++ {
 		inst.Record(fix.ctx, float64(i)+0.5, attribute.String("A", "B"), attribute.String("C", "D"))
@@ -181,7 +185,8 @@ func TestStdoutNoData(t *testing.T) {
 			t.Parallel()
 
 			fix := newFixture(t)
-			_ = metric.Must(fix.meter).NewFloat64Counter(fmt.Sprint("name.", aggName))
+			_, err := fix.meter.SyncFloat64().Counter(fmt.Sprint("name.", aggName))
+			require.NoError(t, err)
 			require.NoError(t, fix.cont.Stop(fix.ctx))
 
 			require.Equal(t, "", fix.Output())
@@ -243,7 +248,8 @@ func TestStdoutResource(t *testing.T) {
 			ctx := context.Background()
 			fix := newFixtureWithResource(t, tc.res)
 
-			counter := metric.Must(fix.meter).NewFloat64Counter("name.lastvalue")
+			counter, err := fix.meter.SyncFloat64().Counter("name.lastvalue")
+			require.NoError(t, err)
 			counter.Add(ctx, 123.456, tc.attrs...)
 
 			require.NoError(t, fix.cont.Stop(fix.ctx))
diff --git a/exporters/stdout/stdouttrace/go.mod b/exporters/stdout/stdouttrace/go.mod
index 9407448a61a..88d59d2d605 100644
--- a/exporters/stdout/stdouttrace/go.mod
+++ b/exporters/stdout/stdouttrace/go.mod
@@ -9,9 +9,9 @@ replace (
 
 require (
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../../bridge/opencensus
@@ -26,8 +26,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../../example/opencens
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../example/zipkin
diff --git a/exporters/zipkin/go.mod b/exporters/zipkin/go.mod
index e517881375e..c9d56ed8d03 100644
--- a/exporters/zipkin/go.mod
+++ b/exporters/zipkin/go.mod
@@ -6,9 +6,9 @@ require (
 	github.com/google/go-cmp v0.5.7
 	github.com/openzipkin/zipkin-go v0.4.0
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/sdk v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/sdk v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel/bridge/opencensus => ../../bridge/opencensus
@@ -23,8 +23,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
diff --git a/exporters/zipkin/model.go b/exporters/zipkin/model.go
index ba9b0f00987..38a7368b7a5 100644
--- a/exporters/zipkin/model.go
+++ b/exporters/zipkin/model.go
@@ -168,6 +168,27 @@ func attributesToJSONMapString(attributes []attribute.KeyValue) string {
 	return (string)(jsonBytes)
 }
 
+// attributeToStringPair serializes each attribute to a string pair
+func attributeToStringPair(kv attribute.KeyValue) (string, string) {
+	switch kv.Value.Type() {
+	// For slice attributes, serialize as JSON list string.
+	case attribute.BOOLSLICE:
+		json, _ := json.Marshal(kv.Value.AsBoolSlice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.INT64SLICE:
+		json, _ := json.Marshal(kv.Value.AsInt64Slice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.FLOAT64SLICE:
+		json, _ := json.Marshal(kv.Value.AsFloat64Slice())
+		return (string)(kv.Key), (string)(json)
+	case attribute.STRINGSLICE:
+		json, _ := json.Marshal(kv.Value.AsStringSlice())
+		return (string)(kv.Key), (string)(json)
+	default:
+		return (string)(kv.Key), kv.Value.Emit()
+	}
+}
+
 // extraZipkinTags are those that may be added to every outgoing span
 var extraZipkinTags = []string{
 	"otel.status_code",
@@ -177,25 +198,15 @@ var extraZipkinTags = []string{
 
 func toZipkinTags(data tracesdk.ReadOnlySpan) map[string]string {
 	attr := data.Attributes()
-	m := make(map[string]string, len(attr)+len(extraZipkinTags))
+	resourceAttr := data.Resource().Attributes()
+	m := make(map[string]string, len(attr)+len(resourceAttr)+len(extraZipkinTags))
 	for _, kv := range attr {
-		switch kv.Value.Type() {
-		// For slice attributes, serialize as JSON list string.
-		case attribute.BOOLSLICE:
-			json, _ := json.Marshal(kv.Value.AsBoolSlice())
-			m[(string)(kv.Key)] = (string)(json)
-		case attribute.INT64SLICE:
-			json, _ := json.Marshal(kv.Value.AsInt64Slice())
-			m[(string)(kv.Key)] = (string)(json)
-		case attribute.FLOAT64SLICE:
-			json, _ := json.Marshal(kv.Value.AsFloat64Slice())
-			m[(string)(kv.Key)] = (string)(json)
-		case attribute.STRINGSLICE:
-			json, _ := json.Marshal(kv.Value.AsStringSlice())
-			m[(string)(kv.Key)] = (string)(json)
-		default:
-			m[(string)(kv.Key)] = kv.Value.Emit()
-		}
+		k, v := attributeToStringPair(kv)
+		m[k] = v
+	}
+	for _, kv := range resourceAttr {
+		k, v := attributeToStringPair(kv)
+		m[k] = v
 	}
 
 	if data.Status().Code != codes.Unset {
diff --git a/exporters/zipkin/model_test.go b/exporters/zipkin/model_test.go
index d4ca9c43ec0..09c6f704418 100644
--- a/exporters/zipkin/model_test.go
+++ b/exporters/zipkin/model_test.go
@@ -39,6 +39,9 @@ import (
 func TestModelConversion(t *testing.T) {
 	resource := resource.NewSchemaless(
 		semconv.ServiceNameKey.String("model-test"),
+		semconv.ServiceVersionKey.String("0.1.0"),
+		attribute.Int64("resource-attr1", 42),
+		attribute.IntSlice("resource-attr2", []int{0, 1, 2}),
 	)
 
 	inputBatch := tracetest.SpanStubs{
@@ -408,6 +411,10 @@ func TestModelConversion(t *testing.T) {
 				"attr3":            "[0,1,2]",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with no parent
@@ -447,6 +454,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of unspecified kind
@@ -486,6 +497,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of internal kind
@@ -525,6 +540,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of client kind
@@ -570,6 +589,10 @@ func TestModelConversion(t *testing.T) {
 				"peer.hostname":    "test-peer-hostname",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of producer kind
@@ -609,6 +632,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data of consumer kind
@@ -648,6 +675,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with no events
@@ -678,6 +709,10 @@ func TestModelConversion(t *testing.T) {
 				"attr2":            "bar",
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "model-test",
+				"service.version":  "0.1.0",
+				"resource-attr1":   "42",
+				"resource-attr2":   "[0,1,2]",
 			},
 		},
 		// model for span data with an "error" attribute set to "false"
@@ -712,7 +747,12 @@ func TestModelConversion(t *testing.T) {
 					Value:     "ev2",
 				},
 			},
-			Tags: nil, // should be omitted
+			Tags: map[string]string{
+				"service.name":    "model-test",
+				"service.version": "0.1.0",
+				"resource-attr1":  "42",
+				"resource-attr2":  "[0,1,2]",
+			}, // only resource tags should be included
 		},
 	}
 	gottenOutputBatch := SpanModels(inputBatch)
diff --git a/exporters/zipkin/zipkin.go b/exporters/zipkin/zipkin.go
index 5c7c20049d9..be14ff12879 100644
--- a/exporters/zipkin/zipkin.go
+++ b/exporters/zipkin/zipkin.go
@@ -180,3 +180,14 @@ func (e *Exporter) errf(format string, args ...interface{}) error {
 	e.logf(format, args...)
 	return fmt.Errorf(format, args...)
 }
+
+// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+func (e *Exporter) MarshalLog() interface{} {
+	return struct {
+		Type string
+		URL  string
+	}{
+		Type: "zipkin",
+		URL:  e.url,
+	}
+}
diff --git a/exporters/zipkin/zipkin_test.go b/exporters/zipkin/zipkin_test.go
index c6984e572e1..c3abe353a37 100644
--- a/exporters/zipkin/zipkin_test.go
+++ b/exporters/zipkin/zipkin_test.go
@@ -200,6 +200,7 @@ func logStoreLogger(s *logStore) *log.Logger {
 func TestExportSpans(t *testing.T) {
 	resource := resource.NewSchemaless(
 		semconv.ServiceNameKey.String("exporter-test"),
+		semconv.ServiceVersionKey.String("0.1.0"),
 	)
 
 	spans := tracetest.SpanStubs{
@@ -271,6 +272,8 @@ func TestExportSpans(t *testing.T) {
 			Tags: map[string]string{
 				"otel.status_code": "Error",
 				"error":            "404, file not found",
+				"service.name":     "exporter-test",
+				"service.version":  "0.1.0",
 			},
 		},
 		// model of child
@@ -299,6 +302,8 @@ func TestExportSpans(t *testing.T) {
 			Tags: map[string]string{
 				"otel.status_code": "Error",
 				"error":            "403, forbidden",
+				"service.name":     "exporter-test",
+				"service.version":  "0.1.0",
 			},
 		},
 	}
diff --git a/go.mod b/go.mod
index 0469e2fa55d..f37c9bf371a 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/go-logr/stdr v1.2.2
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel/trace v1.4.1
 )
 
 replace go.opentelemetry.io/otel => ./
@@ -24,8 +24,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ./example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ./example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ./example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ./example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ./example/zipkin
diff --git a/internal/tools/common.go b/internal/tools/common.go
index 525e5adcf3b..0c7389934ca 100644
--- a/internal/tools/common.go
+++ b/internal/tools/common.go
@@ -18,18 +18,28 @@
 package tools // import "go.opentelemetry.io/otel/internal/tools"
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"path/filepath"
+	"sort"
 	"strings"
+	"text/tabwriter"
+
+	"golang.org/x/mod/modfile"
 )
 
-// FindRepoRoot retrieves the root of the repository containing the current working directory.
-// Beginning at the current working directory (dir), the algorithm checks if joining the ".git"
-// suffix, such as "dir.get", is a valid file. Otherwise, it will continue checking the dir's
-// parent directory until it reaches the repo root or returns an error if it cannot be found.
-func FindRepoRoot() (string, error) {
+// Repo represents a git repository.
+type Repo string
+
+// FindRepoRoot retrieves the root of the repository containing the current
+// working directory. Beginning at the current working directory (dir), the
+// algorithm checks if joining the ".git" suffix, such as "dir.get", is a
+// valid file. Otherwise, it will continue checking the dir's parent directory
+// until it reaches the repo root or returns an error if it cannot be found.
+func FindRepoRoot() (Repo, error) {
 	start, err := os.Getwd()
 	if err != nil {
 		return "", err
@@ -52,6 +62,63 @@ func FindRepoRoot() (string, error) {
 			return "", err
 		}
 
-		return dir, nil
+		return Repo(dir), nil
+	}
+}
+
+// FindModules returns all Go modules contained in Repo r.
+func (r Repo) FindModules() ([]*modfile.File, error) {
+	var results []*modfile.File
+	err := filepath.Walk(string(r), func(path string, info os.FileInfo, walkErr error) error {
+		if walkErr != nil {
+			// Walk failed to walk into this directory. Stop walking and
+			// signal this error.
+			return walkErr
+		}
+
+		if !info.IsDir() {
+			return nil
+		}
+
+		goMod := filepath.Join(path, "go.mod")
+		f, err := os.Open(goMod)
+		if errors.Is(err, os.ErrNotExist) {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+
+		var b bytes.Buffer
+		io.Copy(&b, f)
+		if err = f.Close(); err != nil {
+			return err
+		}
+
+		mFile, err := modfile.Parse(goMod, b.Bytes(), nil)
+		if err != nil {
+			return err
+		}
+		results = append(results, mFile)
+		return nil
+	})
+
+	sort.SliceStable(results, func(i, j int) bool {
+		return results[i].Syntax.Name < results[j].Syntax.Name
+	})
+
+	return results, err
+}
+
+func PrintModFiles(w io.Writer, mFiles []*modfile.File) error {
+	tw := tabwriter.NewWriter(w, 0, 0, 1, ' ', 0)
+	if _, err := fmt.Fprintln(tw, "FILE PATH\tIMPORT PATH"); err != nil {
+		return err
+	}
+	for _, m := range mFiles {
+		if _, err := fmt.Fprintf(tw, "%s\t%s\n", m.Syntax.Name, m.Module.Mod.Path); err != nil {
+			return err
+		}
 	}
+	return tw.Flush()
 }
diff --git a/internal/tools/crosslink/crosslink.go b/internal/tools/crosslink/crosslink.go
index a229bfa6db0..5f19d5b946e 100644
--- a/internal/tools/crosslink/crosslink.go
+++ b/internal/tools/crosslink/crosslink.go
@@ -25,106 +25,42 @@
 package main
 
 import (
-	"encoding/json"
-	"errors"
-	"fmt"
-	"io"
 	"log"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
-	"text/tabwriter"
 
 	"go.opentelemetry.io/otel/internal/tools"
+	"golang.org/x/mod/modfile"
 )
 
-type repo string
-
-type mod struct {
-	filePath   string
-	importPath string
-}
-
-func (r repo) findModules() (mods, error) {
-	var results []mod
-	err := filepath.Walk(string(r), func(path string, info os.FileInfo, err error) error {
-		if !info.IsDir() {
-			return nil
-		}
-
-		_, err = os.Stat(filepath.Join(path, "go.mod"))
-		if errors.Is(err, os.ErrNotExist) {
-			return nil
-		}
-		if err != nil {
-			return err
-		}
-
-		cmd := exec.Command("go", "mod", "edit", "-json")
-		cmd.Dir = path
-		out, err := cmd.Output()
-		if err != nil {
-			return err
-		}
-
-		var result struct {
-			Module struct {
-				Path string
-			}
-		}
-		err = json.Unmarshal(out, &result)
-		if err != nil {
-			return err
-		}
-
-		results = append(results, mod{
-			filePath:   path,
-			importPath: result.Module.Path,
-		})
-		return nil
-	})
-
-	return results, err
-}
-
-type mods []mod
-
-func (m mods) print(w io.Writer) error {
-	tw := tabwriter.NewWriter(w, 0, 0, 1, ' ', 0)
-	if _, err := fmt.Fprintln(tw, "FILE PATH\tIMPORT PATH"); err != nil {
-		return err
-	}
-	for _, m := range m {
-		if _, err := fmt.Fprintf(tw, "%s\t%s\n", m.filePath, m.importPath); err != nil {
-			return err
-		}
-	}
-	return tw.Flush()
-}
-
-func (m mods) crossLink() error {
+func crossLink(m []*modfile.File) error {
 	for _, from := range m {
-		args := []string{"mod", "edit"}
-
+		basepath := filepath.Dir(from.Syntax.Name)
 		for _, to := range m {
-			localPath, err := filepath.Rel(from.filePath, to.filePath)
+			newPath, err := filepath.Rel(basepath, filepath.Dir(to.Syntax.Name))
 			if err != nil {
 				return err
 			}
-			if localPath == "." || localPath == ".." {
-				localPath += "/"
-			} else if !strings.HasPrefix(localPath, "..") {
-				localPath = "./" + localPath
+			switch {
+			case newPath == ".", newPath == "..":
+				newPath += "/"
+			case !strings.HasPrefix(newPath, ".."):
+				newPath = "./" + newPath
 			}
-			args = append(args, "-replace", to.importPath+"="+localPath)
+			from.AddReplace(to.Module.Mod.Path, "", newPath, "")
 		}
 
-		cmd := exec.Command("go", args...)
-		cmd.Dir = from.filePath
-		out, err := cmd.CombinedOutput()
+		from.Cleanup()
+
+		f, err := os.OpenFile(from.Syntax.Name, os.O_RDWR|os.O_TRUNC, 0755)
 		if err != nil {
-			log.Println(string(out))
+			return err
+		}
+		if _, err = f.Write(modfile.Format(from.Syntax)); err != nil {
+			return err
+		}
+		if err = f.Close(); err != nil {
 			return err
 		}
 	}
@@ -132,23 +68,21 @@ func (m mods) crossLink() error {
 }
 
 func main() {
-	repoRootStr, err := tools.FindRepoRoot()
+	root, err := tools.FindRepoRoot()
 	if err != nil {
 		log.Fatalf("unable to find repo root: %v", err)
 	}
 
-	repoRoot := repo(repoRootStr)
-
-	mods, err := repoRoot.findModules()
+	mods, err := root.FindModules()
 	if err != nil {
 		log.Fatalf("unable to list modules: %v", err)
 	}
 
-	if err := mods.print(os.Stdout); err != nil {
+	if err := tools.PrintModFiles(os.Stdout, mods); err != nil {
 		log.Fatalf("unable to print modules: %v", err)
 	}
 
-	if err := mods.crossLink(); err != nil {
+	if err := crossLink(mods); err != nil {
 		log.Fatalf("unable to crosslink: %v", err)
 	}
 }
diff --git a/internal/tools/dbotconf/dbotconf.go b/internal/tools/dbotconf/dbotconf.go
new file mode 100644
index 00000000000..a81a3a83fb9
--- /dev/null
+++ b/internal/tools/dbotconf/dbotconf.go
@@ -0,0 +1,112 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package main provides a utility to generate a complete dependabot
+// configuration for a repository with multiple Go modules.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"text/template"
+
+	"go.opentelemetry.io/otel/internal/tools"
+	"golang.org/x/mod/modfile"
+)
+
+var configPtr = flag.String("config", "./.github/dependabot.yml", "dependabot configuration path")
+
+const configTemplate = `# File generated by "make dependabot-generate"; DO NOT EDIT.
+
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    labels:
+      - dependencies
+      - actions
+      - "Skip Changelog"
+    schedule:
+      day: sunday
+      interval: weekly
+{{- range .}}
+  - package-ecosystem: gomod
+    directory: {{.}}
+    labels:
+      - dependencies
+      - go
+      - "Skip Changelog"
+    schedule:
+      day: sunday
+      interval: weekly
+{{- end}}
+`
+
+func gomodDirectories(basePath string, mods []*modfile.File) []string {
+	var dirs []string
+	for _, m := range mods {
+		targetPath := filepath.Dir(m.Syntax.Name)
+		relPath := strings.TrimPrefix(targetPath, basePath)
+		if relPath == "" {
+			relPath = "/"
+		}
+		dirs = append(dirs, relPath)
+	}
+	sort.Strings(dirs)
+	return dirs
+}
+
+func generate(path string) error {
+	tpl, err := template.New("dependabot.yml").Parse(configTemplate)
+	if err != nil {
+		return fmt.Errorf("parse template: %w", err)
+	}
+
+	root, err := tools.FindRepoRoot()
+	if err != nil {
+		return fmt.Errorf("find repo root: %w", err)
+	}
+
+	mods, err := root.FindModules()
+	if err != nil {
+		return fmt.Errorf("list modules: %w", err)
+	}
+	data := gomodDirectories(string(root), mods)
+
+	f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0755)
+	if err != nil {
+		return err
+	}
+	if err = tpl.Execute(f, data); err != nil {
+		// Best effort.
+		_ = f.Close()
+		return fmt.Errorf("rendering template: %w", err)
+	}
+	if err = f.Close(); err != nil {
+		return fmt.Errorf("closing %s: %w", path, err)
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	if err := generate(*configPtr); err != nil {
+		log.Fatalf("failed to generate dependabot configuration: %v", err)
+	}
+}
diff --git a/internal/tools/go.mod b/internal/tools/go.mod
index fbaac2e35a9..583d72b1a50 100644
--- a/internal/tools/go.mod
+++ b/internal/tools/go.mod
@@ -5,12 +5,13 @@ go 1.16
 require (
 	github.com/client9/misspell v0.3.4
 	github.com/gogo/protobuf v1.3.2
-	github.com/golangci/golangci-lint v1.44.0
+	github.com/golangci/golangci-lint v1.44.2
 	github.com/itchyny/gojq v0.12.6
 	github.com/jcchavezs/porto v0.4.0
 	github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad
 	go.opentelemetry.io/build-tools/multimod v0.0.0-20210920164323-2ceabab23375
 	go.opentelemetry.io/build-tools/semconvgen v0.0.0-20210920164323-2ceabab23375
+	golang.org/x/mod v0.5.1
 	golang.org/x/tools v0.1.9
 )
 
diff --git a/internal/tools/go.sum b/internal/tools/go.sum
index ae43fe3288b..1604fe5e896 100644
--- a/internal/tools/go.sum
+++ b/internal/tools/go.sum
@@ -118,14 +118,14 @@ github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kB
 github.com/bketelsen/crypt v0.0.4/go.mod h1:aI6NrJ0pMGgvZKL1iVgXLnfIFJtfV+bKCoqOes/6LfM=
 github.com/bkielbasa/cyclop v1.2.0 h1:7Jmnh0yL2DjKfw28p86YTd/B4lRGcNuu12sKE35sM7A=
 github.com/bkielbasa/cyclop v1.2.0/go.mod h1:qOI0yy6A7dYC4Zgsa72Ppm9kONl0RoIlPbzot9mhmeI=
-github.com/blizzy78/varnamelen v0.5.0 h1:v9LpMwxzTqAJC4lsD/jR7zWb8a66trcqhTEH4Mk6Fio=
-github.com/blizzy78/varnamelen v0.5.0/go.mod h1:Mc0nLBKI1/FP0Ga4kqMOgBig0eS5QtR107JnMAb1Wuc=
+github.com/blizzy78/varnamelen v0.6.0 h1:TOIDk9qRIMspALZKX8x+5hQfAjuvAFogppnxtvuNmBo=
+github.com/blizzy78/varnamelen v0.6.0/go.mod h1:zy2Eic4qWqjrxa60jG34cfL0VXcSwzUrIx68eJPb4Q8=
 github.com/bombsimon/wsl/v3 v3.3.0 h1:Mka/+kRLoQJq7g2rggtgQsjuI/K5Efd87WX96EWFxjM=
 github.com/bombsimon/wsl/v3 v3.3.0/go.mod h1:st10JtZYLE4D5sC7b8xV4zTKZwAQjCH/Hy2Pm1FNZIc=
-github.com/breml/bidichk v0.2.1 h1:SRNtZuLdfkxtocj+xyHXKC1Uv3jVi6EPYx+NHSTNQvE=
-github.com/breml/bidichk v0.2.1/go.mod h1:zbfeitpevDUGI7V91Uzzuwrn4Vls8MoBMrwtt78jmso=
-github.com/breml/errchkjson v0.2.1 h1:QCToXnY9BNngrbJoW3qfCTt3BdtbnsI6wyP/WGrxxSE=
-github.com/breml/errchkjson v0.2.1/go.mod h1:jZEATw/jF69cL1iy7//Yih8yp/mXp2CBoBr9GJwCAsY=
+github.com/breml/bidichk v0.2.2 h1:w7QXnpH0eCBJm55zGCTJveZEkQBt6Fs5zThIdA6qQ9Y=
+github.com/breml/bidichk v0.2.2/go.mod h1:zbfeitpevDUGI7V91Uzzuwrn4Vls8MoBMrwtt78jmso=
+github.com/breml/errchkjson v0.2.3 h1:97eGTmR/w0paL2SwfRPI1jaAZHaH/fXnxWTw2eEIqE0=
+github.com/breml/errchkjson v0.2.3/go.mod h1:jZEATw/jF69cL1iy7//Yih8yp/mXp2CBoBr9GJwCAsY=
 github.com/butuzov/ireturn v0.1.1 h1:QvrO2QF2+/Cx1WA/vETCIYBKtRjc30vesdoPUNo1EbY=
 github.com/butuzov/ireturn v0.1.1/go.mod h1:Wh6Zl3IMtTpaIKbmwzqi6olnM9ptYQxxVacMsOEFPoc=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
@@ -172,8 +172,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsr
 github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/daixiang0/gci v0.2.9 h1:iwJvwQpBZmMg31w+QQ6jsyZ54KEATn6/nfARbBNW294=
-github.com/daixiang0/gci v0.2.9/go.mod h1:+4dZ7TISfSmqfAGv59ePaHfNzgGtIkHAhhdKggP1JAc=
+github.com/daixiang0/gci v0.3.1-0.20220208004058-76d765e3ab48 h1:9rJGqaC5do9zkvKrtRdx0HJoxj7Jd6vDa0O2eBU0AbU=
+github.com/daixiang0/gci v0.3.1-0.20220208004058-76d765e3ab48/go.mod h1:jaASoJmv/ykO9dAAPy31iJnreV19248qKDdVWf3QgC4=
 github.com/davecgh/go-spew v0.0.0-20161028175848-04cdfd42973b/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -318,8 +318,8 @@ github.com/golangci/go-misc v0.0.0-20180628070357-927a3d87b613 h1:9kfjN3AdxcbsZB
 github.com/golangci/go-misc v0.0.0-20180628070357-927a3d87b613/go.mod h1:SyvUF2NxV+sN8upjjeVYr5W7tyxaT1JVtvhKhOn2ii8=
 github.com/golangci/gofmt v0.0.0-20190930125516-244bba706f1a h1:iR3fYXUjHCR97qWS8ch1y9zPNsgXThGwjKPrYfqMPks=
 github.com/golangci/gofmt v0.0.0-20190930125516-244bba706f1a/go.mod h1:9qCChq59u/eW8im404Q2WWTrnBUQKjpNYKMbU4M7EFU=
-github.com/golangci/golangci-lint v1.44.0 h1:YJPouGNQEdK+x2KsCpWMIBy0q6MSuxHjkWMxJMNj/DU=
-github.com/golangci/golangci-lint v1.44.0/go.mod h1:aBolpzNkmYogKPynGKdOWDCEc8LlwnxZC6w/SJ1TaEs=
+github.com/golangci/golangci-lint v1.44.2 h1:MzvkDt1j1OHkv42/feNJVNNXRFACPp7aAWBWDo5aYQw=
+github.com/golangci/golangci-lint v1.44.2/go.mod h1:KjBgkLvsTWDkhfu12iCrv0gwL1kON5KNhbyjQ6qN7Jo=
 github.com/golangci/lint-1 v0.0.0-20191013205115-297bf364a8e0 h1:MfyDlzVjl1hoaPzPD4Gpb/QgoRfSBR0jdhwGyAWwMSA=
 github.com/golangci/lint-1 v0.0.0-20191013205115-297bf364a8e0/go.mod h1:66R6K6P6VWk9I95jvqGxkqJxVWGFy9XlDwLwVz1RCFg=
 github.com/golangci/maligned v0.0.0-20180506175553-b1d89398deca h1:kNY3/svz5T29MYHubXix4aDDuE3RWHkPvopM/EDv/MA=
@@ -345,8 +345,9 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
+github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
@@ -457,6 +458,8 @@ github.com/hashicorp/memberlist v0.3.0/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOn
 github.com/hashicorp/serf v0.8.2/go.mod h1:6hOLApaqBFA1NXqRQAsxw9QxuDEvNxSQRwA/JwenrHc=
 github.com/hashicorp/serf v0.9.5/go.mod h1:UWDWwZeL5cuWDJdl0C6wrvrUwEqtQ4ZKBKKENpqIUyk=
 github.com/hashicorp/serf v0.9.6/go.mod h1:TXZNMjZQijwlDvp+r0b63xZ45H7JmCmgg4gpTwn9UV4=
+github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
+github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/huandu/xstrings v1.0.0/go.mod h1:4qWG/gcEcfX4z/mBDHJ++3ReCw9ibxbsNJbcucJdbSo=
 github.com/huandu/xstrings v1.2.0/go.mod h1:DvyZB1rfVYsBIigL8HwpZgxHwXozlTgGqn63UyNX5k4=
@@ -531,8 +534,8 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/kulti/thelper v0.5.0 h1:CiEKStgoG4K9bjf/zk3eNX0D0J2iFWzxEY+h9UXmlJg=
-github.com/kulti/thelper v0.5.0/go.mod h1:vMu2Cizjy/grP+jmsvOFDx1kYP6+PD1lqg4Yu5exl2U=
+github.com/kulti/thelper v0.5.1 h1:Uf4CUekH0OvzQTFPrWkstJvXgm6pnNEtQu3HiqEkpB0=
+github.com/kulti/thelper v0.5.1/go.mod h1:vMu2Cizjy/grP+jmsvOFDx1kYP6+PD1lqg4Yu5exl2U=
 github.com/kunwardeep/paralleltest v1.0.3 h1:UdKIkImEAXjR1chUWLn+PNXqWUGs//7tzMeWuP7NhmI=
 github.com/kunwardeep/paralleltest v1.0.3/go.mod h1:vLydzomDFpk7yu5UX02RmP0H8QfRPOV/oFhWN85Mjb4=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
@@ -540,8 +543,8 @@ github.com/kyoh86/exportloopref v0.1.8 h1:5Ry/at+eFdkX9Vsdw3qU4YkvGtzuVfzT4X7S77
 github.com/kyoh86/exportloopref v0.1.8/go.mod h1:1tUcJeiioIs7VWe5gcOObrux3lb66+sBqGZrRkMwPgg=
 github.com/ldez/gomoddirectives v0.2.2 h1:p9/sXuNFArS2RLc+UpYZSI4KQwGMEDWC/LbtF5OPFVg=
 github.com/ldez/gomoddirectives v0.2.2/go.mod h1:cpgBogWITnCfRq2qGoDkKMEVSaarhdBr6g8G04uz6d0=
-github.com/ldez/tagliatelle v0.3.0 h1:Aubm2ZsrsjIGFvdxemMPJaXrSJ5Cys6VWyTQFt9k2dI=
-github.com/ldez/tagliatelle v0.3.0/go.mod h1:8s6WJQwEYHbKZDsp/LjArytKOG8qaMrKQQ3mFukHs88=
+github.com/ldez/tagliatelle v0.3.1 h1:3BqVVlReVUZwafJUwQ+oxbx2BEX2vUG4Yu/NOfMiKiM=
+github.com/ldez/tagliatelle v0.3.1/go.mod h1:8s6WJQwEYHbKZDsp/LjArytKOG8qaMrKQQ3mFukHs88=
 github.com/leonklingele/grouper v1.1.0 h1:tC2y/ygPbMFSBOs3DcyaEMKnnwH7eYKzohOtRrf0SAg=
 github.com/leonklingele/grouper v1.1.0/go.mod h1:uk3I3uDfi9B6PeUjsCKi6ndcf63Uy7snXgR4yDYQVDY=
 github.com/letsencrypt/pkcs11key/v4 v4.0.0/go.mod h1:EFUvBDay26dErnNb70Nd0/VW3tJiIbETBPTl9ATXQag=
@@ -589,8 +592,8 @@ github.com/mbilski/exhaustivestruct v1.2.0 h1:wCBmUnSYufAHO6J4AVWY6ff+oxWxsVFrwg
 github.com/mbilski/exhaustivestruct v1.2.0/go.mod h1:OeTBVxQWoEmB2J2JCHmXWPJ0aksxSUOUy+nvtVEfzXc=
 github.com/mgechev/dots v0.0.0-20210922191527-e955255bf517 h1:zpIH83+oKzcpryru8ceC6BxnoG8TBrhgAvRg8obzup0=
 github.com/mgechev/dots v0.0.0-20210922191527-e955255bf517/go.mod h1:KQ7+USdGKfpPjXk4Ga+5XxQM4Lm4e3gAogrreFAYpOg=
-github.com/mgechev/revive v1.1.3 h1:6tBZacs2/uv9UOpkBQhCtXh2NGgu2Ry97ZyjcN6uDCM=
-github.com/mgechev/revive v1.1.3/go.mod h1:jMzDa13teAuv/KLeqgJw79NDe+1IT0ZO3Mht0vN1Yls=
+github.com/mgechev/revive v1.1.4 h1:sZOjY6GU35Kr9jKa/wsKSHgrFz8eASIB5i3tqWZMp0A=
+github.com/mgechev/revive v1.1.4/go.mod h1:ZZq2bmyssGh8MSPz3VVziqRNIMYTJXzP8MUKG90vZ9A=
 github.com/miekg/dns v1.0.14/go.mod h1:W1PPwlIAgtquWBMBEV9nkV9Cazfe8ScdGz/Lj7v3Nrg=
 github.com/miekg/dns v1.1.26/go.mod h1:bPDLeHnStXmXAq1m/Ch/hvfNHr14JKNPMBo3VZKjuso=
 github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
@@ -714,7 +717,7 @@ github.com/quasilyte/go-ruleguard v0.3.15/go.mod h1:NhuWhnlVEM1gT1A4VJHYfy9MuYSx
 github.com/quasilyte/go-ruleguard/dsl v0.3.0/go.mod h1:KeCP03KrjuSO0H1kTuZQCWlQPulDV6YMIXmpQss17rU=
 github.com/quasilyte/go-ruleguard/dsl v0.3.12-0.20220101150716-969a394a9451/go.mod h1:KeCP03KrjuSO0H1kTuZQCWlQPulDV6YMIXmpQss17rU=
 github.com/quasilyte/go-ruleguard/dsl v0.3.12/go.mod h1:KeCP03KrjuSO0H1kTuZQCWlQPulDV6YMIXmpQss17rU=
-github.com/quasilyte/go-ruleguard/dsl v0.3.15/go.mod h1:KeCP03KrjuSO0H1kTuZQCWlQPulDV6YMIXmpQss17rU=
+github.com/quasilyte/go-ruleguard/dsl v0.3.17/go.mod h1:KeCP03KrjuSO0H1kTuZQCWlQPulDV6YMIXmpQss17rU=
 github.com/quasilyte/go-ruleguard/rules v0.0.0-20201231183845-9e62ed36efe1/go.mod h1:7JTjp89EGyU1d6XfBiXihJNG37wB2VRkd125Q1u7Plc=
 github.com/quasilyte/go-ruleguard/rules v0.0.0-20211022131956-028d6511ab71/go.mod h1:4cgAphtvu7Ftv7vOT2ZOYhC6CvBxZixcasr8qIOTA50=
 github.com/quasilyte/gogrep v0.0.0-20220103110004-ffaa07af02e3 h1:P4QPNn+TK49zJjXKERt/vyPbv/mCHB/zQ4flDYOMN+M=
@@ -748,7 +751,7 @@ github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
 github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/shazow/go-diff v0.0.0-20160112020656-b6b7b6733b8c h1:W65qqJCIOVP4jpqPQ0YvHYKwcMEMVWIzWC5iNQQfBTU=
 github.com/shazow/go-diff v0.0.0-20160112020656-b6b7b6733b8c/go.mod h1:/PevMnwAxekIXwN8qQyfc5gl2NlkB3CQlkizAbOkeBs=
-github.com/shirou/gopsutil/v3 v3.21.12/go.mod h1:BToYZVTlSVlfazpDDYFnsVZLaoRG+g8ufT6fPQLdJzA=
+github.com/shirou/gopsutil/v3 v3.22.1/go.mod h1:WapW1AOOPlHyXr+yOyw3uYx36enocrtSoSBy0L5vUHY=
 github.com/shurcooL/go v0.0.0-20180423040247-9e1955d9fb6e/go.mod h1:TDJrrUr11Vxrven61rcy3hJMUqaf/CLWYhHNPmT14Lk=
 github.com/shurcooL/go-goon v0.0.0-20170922171312-37c2f522c041/go.mod h1:N5mDOmsrJOB+vfqUK+7DmDyjhSLIIBnXo9lvZJj3MWQ=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
@@ -839,8 +842,8 @@ github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqri
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
 github.com/ultraware/funlen v0.0.3 h1:5ylVWm8wsNwH5aWo9438pwvsK0QiqVuUrt9bn7S/iLA=
 github.com/ultraware/funlen v0.0.3/go.mod h1:Dp4UiAus7Wdb9KUZsYWZEWiRzGuM2kXM1lPbfaF6xhA=
-github.com/ultraware/whitespace v0.0.4 h1:If7Va4cM03mpgrNH9k49/VOicWpGoG70XPBFFODYDsg=
-github.com/ultraware/whitespace v0.0.4/go.mod h1:aVMh/gQve5Maj9hQ/hg+F75lr/X5A89uZnzAmWSineA=
+github.com/ultraware/whitespace v0.0.5 h1:hh+/cpIcopyMYbZNVov9iSxvJU3OYQg78Sfaqzi/CzI=
+github.com/ultraware/whitespace v0.0.5/go.mod h1:aVMh/gQve5Maj9hQ/hg+F75lr/X5A89uZnzAmWSineA=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/uudashr/gocognit v1.0.5 h1:rrSex7oHr3/pPLQ0xoWq108XMU8s678FJcQ+aSfOHa4=
@@ -1052,6 +1055,7 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -1135,15 +1139,15 @@ golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210915083310-ed5796bab164/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211013075003-97ac67df715c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211019181941-9d821ace8654/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211105183446-c75c47738b0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211205182925-97ca703d548d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211213223007-03aa0b5f6827/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e h1:fLOSk5Q00efkSvAm+4xcoXD+RRmLmmulPn5I3Y9F2EM=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220111092808-5a964db01320 h1:0jf+tOCoZ3LyutmCOWpVni1chK4VfFLhRsDK7MhqGRY=
+golang.org/x/sys v0.0.0-20220111092808-5a964db01320/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@@ -1243,7 +1247,6 @@ golang.org/x/tools v0.0.0-20201023174141-c8cfbd0f21e6/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20201028025901-8cd080b735b3/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201110124207-079ba7bd75cd/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201114224030-61ea331ec02b/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.0.0-20201118003311-bd56c0adb394/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201201161351-ac6f37ff4c2a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
diff --git a/metric/config.go b/metric/config.go
index 6049015cbe7..621e4c5fcb8 100644
--- a/metric/config.go
+++ b/metric/config.go
@@ -32,7 +32,7 @@ func (cfg MeterConfig) SchemaURL() string {
 
 // MeterOption is an interface for applying Meter options.
 type MeterOption interface {
-	// ApplyMeter is used to set a MeterOption value of a MeterConfig.
+	// applyMeter is used to set a MeterOption value of a MeterConfig.
 	applyMeter(MeterConfig) MeterConfig
 }
 
diff --git a/metric/example_test.go b/metric/example_test.go
index 573d7070dd4..92e0e2cd958 100644
--- a/metric/example_test.go
+++ b/metric/example_test.go
@@ -20,15 +20,16 @@ import (
 	"runtime"
 	"time"
 
-	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/nonrecording"
 	"go.opentelemetry.io/otel/metric/unit"
 )
 
-func ExampleSyncInstrument() {
+//nolint:govet // Meter doesn't register for go vet
+func ExampleMeter_synchronous() {
 	// In a library or program this would be provided by otel.GetMeterProvider().
-	meterProvider := metric.NewNoopMeterProvider()
+	meterProvider := nonrecording.NewNoopMeterProvider()
 
 	workDuration, err := meterProvider.Meter("go.opentelemetry.io/otel/metric#SyncExample").SyncInt64().Histogram(
 		"workDuration",
@@ -42,13 +43,14 @@ func ExampleSyncInstrument() {
 	ctx := context.Background()
 	// Do work
 	// ...
-	workDuration.Record(ctx, time.Now().Sub(startTime).Milliseconds())
+	workDuration.Record(ctx, time.Since(startTime).Milliseconds())
 
 }
 
-func ExampleAsyncInstrument() {
+//nolint:govet // Meter doesn't register for go vet
+func ExampleMeter_asynchronous_single() {
 	// In a library or program this would be provided by otel.GetMeterProvider().
-	meterProvider := metric.NewNoopMeterProvider()
+	meterProvider := nonrecording.NewNoopMeterProvider()
 	meter := meterProvider.Meter("go.opentelemetry.io/otel/metric#AsyncExample")
 
 	memoryUsage, err := meter.AsyncInt64().Gauge(
@@ -75,8 +77,9 @@ func ExampleAsyncInstrument() {
 	}
 }
 
-func ExampleMultipleAsyncInstrument() {
-	meterProvider := metric.NewNoopMeterProvider()
+//nolint:govet // Meter doesn't register for go vet
+func ExampleMeter_asynchronous_multiple() {
+	meterProvider := nonrecording.NewNoopMeterProvider()
 	meter := meterProvider.Meter("go.opentelemetry.io/otel/metric#MultiAsyncExample")
 
 	// This is just a sample of memory stats to record from the Memstats
diff --git a/metric/go.mod b/metric/go.mod
index 013bdad17aa..7d510be1f32 100644
--- a/metric/go.mod
+++ b/metric/go.mod
@@ -2,7 +2,7 @@ module go.opentelemetry.io/otel/metric
 
 go 1.16
 
-require go.opentelemetry.io/otel v1.3.0
+require go.opentelemetry.io/otel v1.4.1
 
 replace go.opentelemetry.io/otel => ../
 
@@ -18,8 +18,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../example/zipkin
diff --git a/metric/instrument/asyncfloat64/asyncfloat64.go b/metric/instrument/asyncfloat64/asyncfloat64.go
index aae69b138c5..91c034fb2a0 100644
--- a/metric/instrument/asyncfloat64/asyncfloat64.go
+++ b/metric/instrument/asyncfloat64/asyncfloat64.go
@@ -21,8 +21,8 @@ import (
 	"go.opentelemetry.io/otel/metric/instrument"
 )
 
-// Instruments provides access to individual instruments.
-type Instruments interface {
+// InstrumentProvider provides access to individual instruments.
+type InstrumentProvider interface {
 	// Counter creates an instrument for recording increasing values.
 	Counter(name string, opts ...instrument.Option) (Counter, error)
 
diff --git a/metric/instrument/asyncfloat64/noop.go b/metric/instrument/asyncfloat64/noop.go
deleted file mode 100644
index 2b6ce755085..00000000000
--- a/metric/instrument/asyncfloat64/noop.go
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package asyncfloat64 // import "go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
-
-import (
-	"context"
-
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric/instrument"
-)
-
-func NewNoopInstruments() Instruments {
-	return nonrecordingInstrument{}
-}
-
-type nonrecordingInstrument struct {
-	instrument.Asynchronous
-}
-
-var (
-	_ Instruments   = nonrecordingInstrument{}
-	_ Counter       = nonrecordingInstrument{}
-	_ UpDownCounter = nonrecordingInstrument{}
-	_ Gauge         = nonrecordingInstrument{}
-)
-
-func (n nonrecordingInstrument) Counter(name string, opts ...instrument.Option) (Counter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) UpDownCounter(name string, opts ...instrument.Option) (UpDownCounter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) Gauge(name string, opts ...instrument.Option) (Gauge, error) {
-	return n, nil
-}
-
-func (nonrecordingInstrument) Observe(context.Context, float64, ...attribute.KeyValue) {
-
-}
diff --git a/metric/instrument/asyncint64/asyncint64.go b/metric/instrument/asyncint64/asyncint64.go
index ad3668e2183..9dfba553d78 100644
--- a/metric/instrument/asyncint64/asyncint64.go
+++ b/metric/instrument/asyncint64/asyncint64.go
@@ -21,8 +21,8 @@ import (
 	"go.opentelemetry.io/otel/metric/instrument"
 )
 
-// Instruments provides access to individual instruments.
-type Instruments interface {
+// InstrumentProvider provides access to individual instruments.
+type InstrumentProvider interface {
 	// Counter creates an instrument for recording increasing values.
 	Counter(name string, opts ...instrument.Option) (Counter, error)
 
diff --git a/metric/instrument/asyncint64/noop.go b/metric/instrument/asyncint64/noop.go
deleted file mode 100644
index d55bf48fd83..00000000000
--- a/metric/instrument/asyncint64/noop.go
+++ /dev/null
@@ -1,52 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package asyncint64 // import "go.opentelemetry.io/otel/metric/instrument/asyncint64"
-
-import (
-	"context"
-
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric/instrument"
-)
-
-func NewNoopInstruments() Instruments {
-	return nonrecordingInstrument{}
-}
-
-type nonrecordingInstrument struct {
-	instrument.Asynchronous
-}
-
-var (
-	_ Instruments   = nonrecordingInstrument{}
-	_ Counter       = nonrecordingInstrument{}
-	_ UpDownCounter = nonrecordingInstrument{}
-	_ Gauge         = nonrecordingInstrument{}
-)
-
-func (n nonrecordingInstrument) Counter(name string, opts ...instrument.Option) (Counter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) UpDownCounter(name string, opts ...instrument.Option) (UpDownCounter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) Gauge(name string, opts ...instrument.Option) (Gauge, error) {
-	return n, nil
-}
-
-func (nonrecordingInstrument) Observe(context.Context, int64, ...attribute.KeyValue) {
-}
diff --git a/metric/instrument/syncfloat64/noop.go b/metric/instrument/syncfloat64/noop.go
deleted file mode 100644
index 2e7cfe56af9..00000000000
--- a/metric/instrument/syncfloat64/noop.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package syncfloat64 // import "go.opentelemetry.io/otel/metric/instrument/syncfloat64"
-
-import (
-	"context"
-
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric/instrument"
-)
-
-func NewNoopInstruments() Instruments {
-	return nonrecordingInstrument{}
-}
-
-type nonrecordingInstrument struct {
-	instrument.Synchronous
-}
-
-var (
-	_ Instruments   = nonrecordingInstrument{}
-	_ Counter       = nonrecordingInstrument{}
-	_ UpDownCounter = nonrecordingInstrument{}
-	_ Histogram     = nonrecordingInstrument{}
-)
-
-func (n nonrecordingInstrument) Counter(name string, opts ...instrument.Option) (Counter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) UpDownCounter(name string, opts ...instrument.Option) (UpDownCounter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) Histogram(name string, opts ...instrument.Option) (Histogram, error) {
-	return n, nil
-}
-
-func (nonrecordingInstrument) Add(context.Context, float64, ...attribute.KeyValue) {
-
-}
-
-func (nonrecordingInstrument) Record(context.Context, float64, ...attribute.KeyValue) {
-
-}
diff --git a/metric/instrument/syncfloat64/syncfloat64.go b/metric/instrument/syncfloat64/syncfloat64.go
index cd3d721535b..1989292ecf8 100644
--- a/metric/instrument/syncfloat64/syncfloat64.go
+++ b/metric/instrument/syncfloat64/syncfloat64.go
@@ -21,8 +21,8 @@ import (
 	"go.opentelemetry.io/otel/metric/instrument"
 )
 
-// Instruments provides access to individual instruments.
-type Instruments interface {
+// InstrumentProvider provides access to individual instruments.
+type InstrumentProvider interface {
 	// Counter creates an instrument for recording increasing values.
 	Counter(name string, opts ...instrument.Option) (Counter, error)
 	// UpDownCounter creates an instrument for recording changes of a value.
diff --git a/metric/instrument/syncint64/noop.go b/metric/instrument/syncint64/noop.go
deleted file mode 100644
index fc5d51c4f52..00000000000
--- a/metric/instrument/syncint64/noop.go
+++ /dev/null
@@ -1,54 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package syncint64 // import "go.opentelemetry.io/otel/metric/instrument/syncint64"
-
-import (
-	"context"
-
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric/instrument"
-)
-
-func NewNoopInstruments() Instruments {
-	return nonrecordingInstrument{}
-}
-
-type nonrecordingInstrument struct {
-	instrument.Synchronous
-}
-
-var (
-	_ Instruments   = nonrecordingInstrument{}
-	_ Counter       = nonrecordingInstrument{}
-	_ UpDownCounter = nonrecordingInstrument{}
-	_ Histogram     = nonrecordingInstrument{}
-)
-
-func (n nonrecordingInstrument) Counter(name string, opts ...instrument.Option) (Counter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) UpDownCounter(name string, opts ...instrument.Option) (UpDownCounter, error) {
-	return n, nil
-}
-
-func (n nonrecordingInstrument) Histogram(name string, opts ...instrument.Option) (Histogram, error) {
-	return n, nil
-}
-
-func (nonrecordingInstrument) Add(context.Context, int64, ...attribute.KeyValue) {
-}
-func (nonrecordingInstrument) Record(context.Context, int64, ...attribute.KeyValue) {
-}
diff --git a/metric/instrument/syncint64/syncint64.go b/metric/instrument/syncint64/syncint64.go
index 96f99749b49..ee882bcd922 100644
--- a/metric/instrument/syncint64/syncint64.go
+++ b/metric/instrument/syncint64/syncint64.go
@@ -21,8 +21,8 @@ import (
 	"go.opentelemetry.io/otel/metric/instrument"
 )
 
-// Instruments provides access to individual instruments.
-type Instruments interface {
+// InstrumentProvider provides access to individual instruments.
+type InstrumentProvider interface {
 	// Counter creates an instrument for recording increasing values.
 	Counter(name string, opts ...instrument.Option) (Counter, error)
 	// UpDownCounter creates an instrument for recording changes of a value.
diff --git a/metric/meter.go b/metric/meter.go
index b79e6433db1..21fc1c499fb 100644
--- a/metric/meter.go
+++ b/metric/meter.go
@@ -40,12 +40,12 @@ type Meter interface {
 	// AsyncInt64 is the namespace for the Asynchronous Integer instruments.
 	//
 	// To Observe data with instruments it must be registered in a callback.
-	AsyncInt64() asyncint64.Instruments
+	AsyncInt64() asyncint64.InstrumentProvider
 
 	// AsyncFloat64 is the namespace for the Asynchronous Float instruments
 	//
 	// To Observe data with instruments it must be registered in a callback.
-	AsyncFloat64() asyncfloat64.Instruments
+	AsyncFloat64() asyncfloat64.InstrumentProvider
 
 	// RegisterCallback captures the function that will be called during Collect.
 	//
@@ -54,7 +54,7 @@ type Meter interface {
 	RegisterCallback(insts []instrument.Asynchronous, function func(context.Context)) error
 
 	// SyncInt64 is the namespace for the Synchronous Integer instruments
-	SyncInt64() syncint64.Instruments
+	SyncInt64() syncint64.InstrumentProvider
 	// SyncFloat64 is the namespace for the Synchronous Float instruments
-	SyncFloat64() syncfloat64.Instruments
+	SyncFloat64() syncfloat64.InstrumentProvider
 }
diff --git a/metric/nonrecording/instruments.go b/metric/nonrecording/instruments.go
new file mode 100644
index 00000000000..84a6aa89c31
--- /dev/null
+++ b/metric/nonrecording/instruments.go
@@ -0,0 +1,138 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package nonrecording // import "go.opentelemetry.io/otel/metric/nonrecording"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/asyncint64"
+	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/syncint64"
+)
+
+type nonrecordingAsyncFloat64Instrument struct {
+	instrument.Asynchronous
+}
+
+var (
+	_ asyncfloat64.InstrumentProvider = nonrecordingAsyncFloat64Instrument{}
+	_ asyncfloat64.Counter            = nonrecordingAsyncFloat64Instrument{}
+	_ asyncfloat64.UpDownCounter      = nonrecordingAsyncFloat64Instrument{}
+	_ asyncfloat64.Gauge              = nonrecordingAsyncFloat64Instrument{}
+)
+
+func (n nonrecordingAsyncFloat64Instrument) Counter(name string, opts ...instrument.Option) (asyncfloat64.Counter, error) {
+	return n, nil
+}
+
+func (n nonrecordingAsyncFloat64Instrument) UpDownCounter(name string, opts ...instrument.Option) (asyncfloat64.UpDownCounter, error) {
+	return n, nil
+}
+
+func (n nonrecordingAsyncFloat64Instrument) Gauge(name string, opts ...instrument.Option) (asyncfloat64.Gauge, error) {
+	return n, nil
+}
+
+func (nonrecordingAsyncFloat64Instrument) Observe(context.Context, float64, ...attribute.KeyValue) {
+
+}
+
+type nonrecordingAsyncInt64Instrument struct {
+	instrument.Asynchronous
+}
+
+var (
+	_ asyncint64.InstrumentProvider = nonrecordingAsyncInt64Instrument{}
+	_ asyncint64.Counter            = nonrecordingAsyncInt64Instrument{}
+	_ asyncint64.UpDownCounter      = nonrecordingAsyncInt64Instrument{}
+	_ asyncint64.Gauge              = nonrecordingAsyncInt64Instrument{}
+)
+
+func (n nonrecordingAsyncInt64Instrument) Counter(name string, opts ...instrument.Option) (asyncint64.Counter, error) {
+	return n, nil
+}
+
+func (n nonrecordingAsyncInt64Instrument) UpDownCounter(name string, opts ...instrument.Option) (asyncint64.UpDownCounter, error) {
+	return n, nil
+}
+
+func (n nonrecordingAsyncInt64Instrument) Gauge(name string, opts ...instrument.Option) (asyncint64.Gauge, error) {
+	return n, nil
+}
+
+func (nonrecordingAsyncInt64Instrument) Observe(context.Context, int64, ...attribute.KeyValue) {
+}
+
+type nonrecordingSyncFloat64Instrument struct {
+	instrument.Synchronous
+}
+
+var (
+	_ syncfloat64.InstrumentProvider = nonrecordingSyncFloat64Instrument{}
+	_ syncfloat64.Counter            = nonrecordingSyncFloat64Instrument{}
+	_ syncfloat64.UpDownCounter      = nonrecordingSyncFloat64Instrument{}
+	_ syncfloat64.Histogram          = nonrecordingSyncFloat64Instrument{}
+)
+
+func (n nonrecordingSyncFloat64Instrument) Counter(name string, opts ...instrument.Option) (syncfloat64.Counter, error) {
+	return n, nil
+}
+
+func (n nonrecordingSyncFloat64Instrument) UpDownCounter(name string, opts ...instrument.Option) (syncfloat64.UpDownCounter, error) {
+	return n, nil
+}
+
+func (n nonrecordingSyncFloat64Instrument) Histogram(name string, opts ...instrument.Option) (syncfloat64.Histogram, error) {
+	return n, nil
+}
+
+func (nonrecordingSyncFloat64Instrument) Add(context.Context, float64, ...attribute.KeyValue) {
+
+}
+
+func (nonrecordingSyncFloat64Instrument) Record(context.Context, float64, ...attribute.KeyValue) {
+
+}
+
+type nonrecordingSyncInt64Instrument struct {
+	instrument.Synchronous
+}
+
+var (
+	_ syncint64.InstrumentProvider = nonrecordingSyncInt64Instrument{}
+	_ syncint64.Counter            = nonrecordingSyncInt64Instrument{}
+	_ syncint64.UpDownCounter      = nonrecordingSyncInt64Instrument{}
+	_ syncint64.Histogram          = nonrecordingSyncInt64Instrument{}
+)
+
+func (n nonrecordingSyncInt64Instrument) Counter(name string, opts ...instrument.Option) (syncint64.Counter, error) {
+	return n, nil
+}
+
+func (n nonrecordingSyncInt64Instrument) UpDownCounter(name string, opts ...instrument.Option) (syncint64.UpDownCounter, error) {
+	return n, nil
+}
+
+func (n nonrecordingSyncInt64Instrument) Histogram(name string, opts ...instrument.Option) (syncint64.Histogram, error) {
+	return n, nil
+}
+
+func (nonrecordingSyncInt64Instrument) Add(context.Context, int64, ...attribute.KeyValue) {
+}
+func (nonrecordingSyncInt64Instrument) Record(context.Context, int64, ...attribute.KeyValue) {
+}
diff --git a/metric/noop.go b/metric/nonrecording/meter.go
similarity index 56%
rename from metric/noop.go
rename to metric/nonrecording/meter.go
index 975c0236012..2acea49d8a1 100644
--- a/metric/noop.go
+++ b/metric/nonrecording/meter.go
@@ -12,11 +12,12 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package metric // import "go.opentelemetry.io/otel/metric"
+package nonrecording // import "go.opentelemetry.io/otel/metric/nonrecording"
 
 import (
 	"context"
 
+	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/instrument"
 	"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
 	"go.opentelemetry.io/otel/metric/instrument/asyncint64"
@@ -24,33 +25,39 @@ import (
 	"go.opentelemetry.io/otel/metric/instrument/syncint64"
 )
 
-func NewNoopMeterProvider() MeterProvider {
+// NewNoopMeterProvider creates a MeterProvider that does not record any metrics.
+func NewNoopMeterProvider() metric.MeterProvider {
 	return noopMeterProvider{}
 }
 
 type noopMeterProvider struct{}
 
-var _ MeterProvider = noopMeterProvider{}
+var _ metric.MeterProvider = noopMeterProvider{}
 
-func (noopMeterProvider) Meter(instrumentationName string, opts ...MeterOption) Meter {
+func (noopMeterProvider) Meter(instrumentationName string, opts ...metric.MeterOption) metric.Meter {
+	return noopMeter{}
+}
+
+// NewNoopMeter creates a Meter that does not record any metrics.
+func NewNoopMeter() metric.Meter {
 	return noopMeter{}
 }
 
 type noopMeter struct{}
 
-var _ Meter = noopMeter{}
+var _ metric.Meter = noopMeter{}
 
-func (noopMeter) AsyncInt64() asyncint64.Instruments {
-	return asyncint64.NewNoopInstruments()
+func (noopMeter) AsyncInt64() asyncint64.InstrumentProvider {
+	return nonrecordingAsyncInt64Instrument{}
 }
-func (noopMeter) AsyncFloat64() asyncfloat64.Instruments {
-	return asyncfloat64.NewNoopInstruments()
+func (noopMeter) AsyncFloat64() asyncfloat64.InstrumentProvider {
+	return nonrecordingAsyncFloat64Instrument{}
 }
-func (noopMeter) SyncInt64() syncint64.Instruments {
-	return syncint64.NewNoopInstruments()
+func (noopMeter) SyncInt64() syncint64.InstrumentProvider {
+	return nonrecordingSyncInt64Instrument{}
 }
-func (noopMeter) SyncFloat64() syncfloat64.Instruments {
-	return syncfloat64.NewNoopInstruments()
+func (noopMeter) SyncFloat64() syncfloat64.InstrumentProvider {
+	return nonrecordingSyncFloat64Instrument{}
 }
 func (noopMeter) RegisterCallback([]instrument.Asynchronous, func(context.Context)) error {
 	return nil
diff --git a/sdk/export/metric/go.mod b/sdk/export/metric/go.mod
index 2b10328d6a7..415e71a87f9 100644
--- a/sdk/export/metric/go.mod
+++ b/sdk/export/metric/go.mod
@@ -17,8 +17,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../../example/opencens
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../../example/zipkin
@@ -42,9 +40,8 @@ replace go.opentelemetry.io/otel/sdk/metric => ../../metric
 replace go.opentelemetry.io/otel/trace => ../../../trace
 
 require (
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk/metric v0.0.0-00010101000000-000000000000
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/sdk/metric v0.27.0
 )
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../../example/passthrough
diff --git a/sdk/go.mod b/sdk/go.mod
index 548e5460134..bad9bd0c41c 100644
--- a/sdk/go.mod
+++ b/sdk/go.mod
@@ -8,8 +8,8 @@ require (
 	github.com/go-logr/logr v1.2.2
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/trace v1.4.1
 	golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7
 )
 
@@ -25,8 +25,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../example/zipkin
diff --git a/sdk/internal/env/env.go b/sdk/internal/env/env.go
index 397fd9593cc..df7a05626b3 100644
--- a/sdk/internal/env/env.go
+++ b/sdk/internal/env/env.go
@@ -40,6 +40,21 @@ const (
 	// Note: Must be less than or equal to EnvBatchSpanProcessorMaxQueueSize
 	// i.e. 512
 	BatchSpanProcessorMaxExportBatchSizeKey = "OTEL_BSP_MAX_EXPORT_BATCH_SIZE"
+
+	// SpanAttributesCountKey
+	// Maximum allowed span attribute count
+	// Default: 128
+	SpanAttributesCountKey = "OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT"
+
+	// SpanEventCountKey
+	// Maximum allowed span event count
+	// Default: 128
+	SpanEventCountKey = "OTEL_SPAN_EVENT_COUNT_LIMIT"
+
+	// SpanLinkCountKey
+	// Maximum allowed span link count
+	// Default: 128
+	SpanLinkCountKey = "OTEL_SPAN_LINK_COUNT_LIMIT"
 )
 
 // IntEnvOr returns the int value of the environment variable with name key if
diff --git a/sdk/metric/benchmark_test.go b/sdk/metric/benchmark_test.go
index b206b7cbf83..fd5f49bd1ef 100644
--- a/sdk/metric/benchmark_test.go
+++ b/sdk/metric/benchmark_test.go
@@ -22,7 +22,9 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
-	"go.opentelemetry.io/otel/metric/global"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/syncint64"
 	sdk "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/export"
 	"go.opentelemetry.io/otel/sdk/metric/processor/processortest"
@@ -44,7 +46,7 @@ func newFixture(b *testing.B) *benchFixture {
 	}
 
 	bf.accumulator = sdk.NewAccumulator(bf)
-	bf.meter = metric.WrapMeterImpl(bf.accumulator)
+	bf.meter = sdkapi.WrapMeterImpl(bf.accumulator)
 	return bf
 }
 
@@ -56,8 +58,33 @@ func (f *benchFixture) Meter(_ string, _ ...metric.MeterOption) metric.Meter {
 	return f.meter
 }
 
-func (f *benchFixture) meterMust() metric.MeterMust {
-	return metric.Must(f.meter)
+func (f *benchFixture) iCounter(name string) syncint64.Counter {
+	ctr, err := f.meter.SyncInt64().Counter(name)
+	if err != nil {
+		f.B.Error(err)
+	}
+	return ctr
+}
+func (f *benchFixture) fCounter(name string) syncfloat64.Counter {
+	ctr, err := f.meter.SyncFloat64().Counter(name)
+	if err != nil {
+		f.B.Error(err)
+	}
+	return ctr
+}
+func (f *benchFixture) iHistogram(name string) syncint64.Histogram {
+	ctr, err := f.meter.SyncInt64().Histogram(name)
+	if err != nil {
+		f.B.Error(err)
+	}
+	return ctr
+}
+func (f *benchFixture) fHistogram(name string) syncfloat64.Histogram {
+	ctr, err := f.meter.SyncFloat64().Histogram(name)
+	if err != nil {
+		f.B.Error(err)
+	}
+	return ctr
 }
 
 func makeLabels(n int) []attribute.KeyValue {
@@ -81,7 +108,7 @@ func benchmarkLabels(b *testing.B, n int) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(n)
-	cnt := fix.meterMust().NewInt64Counter("int64.sum")
+	cnt := fix.iCounter("int64.sum")
 
 	b.ResetTimer()
 
@@ -154,31 +181,33 @@ func BenchmarkIterator_16(b *testing.B) {
 
 // Counters
 
-func BenchmarkGlobalInt64CounterAddWithSDK(b *testing.B) {
-	// Compare with BenchmarkInt64CounterAdd() to see overhead of global
-	// package. This is in the SDK to avoid the API from depending on the
-	// SDK.
-	ctx := context.Background()
-	fix := newFixture(b)
+// TODO readd global
 
-	sdk := global.Meter("test")
-	global.SetMeterProvider(fix)
+// func BenchmarkGlobalInt64CounterAddWithSDK(b *testing.B) {
+// 	// Compare with BenchmarkInt64CounterAdd() to see overhead of global
+// 	// package. This is in the SDK to avoid the API from depending on the
+// 	// SDK.
+// 	ctx := context.Background()
+// 	fix := newFixture(b)
 
-	labs := []attribute.KeyValue{attribute.String("A", "B")}
-	cnt := Must(sdk).NewInt64Counter("int64.sum")
+// 	sdk := global.Meter("test")
+// 	global.SetMeterProvider(fix)
 
-	b.ResetTimer()
+// 	labs := []attribute.KeyValue{attribute.String("A", "B")}
+// 	cnt := Must(sdk).NewInt64Counter("int64.sum")
 
-	for i := 0; i < b.N; i++ {
-		cnt.Add(ctx, 1, labs...)
-	}
-}
+// 	b.ResetTimer()
+
+// 	for i := 0; i < b.N; i++ {
+// 		cnt.Add(ctx, 1, labs...)
+// 	}
+// }
 
 func BenchmarkInt64CounterAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	cnt := fix.meterMust().NewInt64Counter("int64.sum")
+	cnt := fix.iCounter("int64.sum")
 
 	b.ResetTimer()
 
@@ -191,7 +220,7 @@ func BenchmarkFloat64CounterAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	cnt := fix.meterMust().NewFloat64Counter("float64.sum")
+	cnt := fix.fCounter("float64.sum")
 
 	b.ResetTimer()
 
@@ -206,7 +235,7 @@ func BenchmarkInt64LastValueAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	mea := fix.meterMust().NewInt64Histogram("int64.lastvalue")
+	mea := fix.iHistogram("int64.lastvalue")
 
 	b.ResetTimer()
 
@@ -219,7 +248,7 @@ func BenchmarkFloat64LastValueAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	mea := fix.meterMust().NewFloat64Histogram("float64.lastvalue")
+	mea := fix.fHistogram("float64.lastvalue")
 
 	b.ResetTimer()
 
@@ -234,7 +263,7 @@ func BenchmarkInt64HistogramAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	mea := fix.meterMust().NewInt64Histogram("int64.histogram")
+	mea := fix.iHistogram("int64.histogram")
 
 	b.ResetTimer()
 
@@ -247,7 +276,7 @@ func BenchmarkFloat64HistogramAdd(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	mea := fix.meterMust().NewFloat64Histogram("float64.histogram")
+	mea := fix.fHistogram("float64.histogram")
 
 	b.ResetTimer()
 
@@ -264,12 +293,12 @@ func BenchmarkObserverRegistration(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		names = append(names, fmt.Sprintf("test.%d.lastvalue", i))
 	}
-	cb := func(_ context.Context, result metric.Int64ObserverResult) {}
 
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
-		fix.meterMust().NewInt64GaugeObserver(names[i], cb)
+		ctr, _ := fix.meter.AsyncInt64().Counter(names[i])
+		_ = fix.meter.RegisterCallback([]instrument.Asynchronous{ctr}, func(context.Context) {})
 	}
 }
 
@@ -277,11 +306,16 @@ func BenchmarkGaugeObserverObservationInt64(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	_ = fix.meterMust().NewInt64GaugeObserver("test.lastvalue", func(_ context.Context, result metric.Int64ObserverResult) {
+	ctr, _ := fix.meter.AsyncInt64().Counter("test.lastvalue")
+	err := fix.meter.RegisterCallback([]instrument.Asynchronous{ctr}, func(ctx context.Context) {
 		for i := 0; i < b.N; i++ {
-			result.Observe((int64)(i), labs...)
+			ctr.Observe(ctx, (int64)(i), labs...)
 		}
 	})
+	if err != nil {
+		b.Errorf("could not register callback: %v", err)
+		b.FailNow()
+	}
 
 	b.ResetTimer()
 
@@ -292,11 +326,16 @@ func BenchmarkGaugeObserverObservationFloat64(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(1)
-	_ = fix.meterMust().NewFloat64GaugeObserver("test.lastvalue", func(_ context.Context, result metric.Float64ObserverResult) {
+	ctr, _ := fix.meter.AsyncFloat64().Counter("test.lastvalue")
+	err := fix.meter.RegisterCallback([]instrument.Asynchronous{ctr}, func(ctx context.Context) {
 		for i := 0; i < b.N; i++ {
-			result.Observe((float64)(i), labs...)
+			ctr.Observe(ctx, (float64)(i), labs...)
 		}
 	})
+	if err != nil {
+		b.Errorf("could not register callback: %v", err)
+		b.FailNow()
+	}
 
 	b.ResetTimer()
 
@@ -310,17 +349,18 @@ func benchmarkBatchRecord8Labels(b *testing.B, numInst int) {
 	ctx := context.Background()
 	fix := newFixture(b)
 	labs := makeLabels(numLabels)
-	var meas []sdkapi.Measurement
+	var meas []syncint64.Counter
 
 	for i := 0; i < numInst; i++ {
-		inst := fix.meterMust().NewInt64Counter(fmt.Sprintf("int64.%d.sum", i))
-		meas = append(meas, inst.Measurement(1))
+		meas = append(meas, fix.iCounter(fmt.Sprintf("int64.%d.sum", i)))
 	}
 
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
-		fix.accumulator.RecordBatch(ctx, labs, meas...)
+		for _, ctr := range meas {
+			ctr.Add(ctx, 1, labs...)
+		}
 	}
 }
 
@@ -346,7 +386,7 @@ func BenchmarkRepeatedDirectCalls(b *testing.B) {
 	ctx := context.Background()
 	fix := newFixture(b)
 
-	c := fix.meterMust().NewInt64Counter("int64.sum")
+	c := fix.iCounter("int64.sum")
 	k := attribute.String("bench", "true")
 
 	b.ResetTimer()
diff --git a/sdk/metric/controller/basic/pull_test.go b/sdk/metric/controller/basic/pull_test.go
index 2df72b967cc..2284e68a71d 100644
--- a/sdk/metric/controller/basic/pull_test.go
+++ b/sdk/metric/controller/basic/pull_test.go
@@ -21,6 +21,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/require"
+
 	"go.opentelemetry.io/otel/attribute"
 	controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
 	"go.opentelemetry.io/otel/sdk/metric/controller/controllertest"
diff --git a/sdk/metric/correct_test.go b/sdk/metric/correct_test.go
index 57550c29ccb..1b24a209c76 100644
--- a/sdk/metric/correct_test.go
+++ b/sdk/metric/correct_test.go
@@ -26,6 +26,9 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/asyncint64"
+	"go.opentelemetry.io/otel/metric/nonrecording"
 	metricsdk "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/aggregator"
 	"go.opentelemetry.io/otel/sdk/metric/export"
@@ -34,8 +37,6 @@ import (
 	"go.opentelemetry.io/otel/sdk/metric/sdkapi"
 )
 
-var Must = metric.Must
-
 type handler struct {
 	sync.Mutex
 	err error
@@ -88,7 +89,7 @@ func newSDK(t *testing.T) (metric.Meter, *metricsdk.Accumulator, *testSelector,
 	accum := metricsdk.NewAccumulator(
 		processor,
 	)
-	meter := metric.WrapMeterImpl(accum)
+	meter := sdkapi.WrapMeterImpl(accum)
 	return meter, accum, testSelector, processor
 }
 
@@ -96,7 +97,8 @@ func TestInputRangeCounter(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	counter := Must(meter).NewInt64Counter("name.sum")
+	counter, err := meter.SyncInt64().Counter("name.sum")
+	require.NoError(t, err)
 
 	counter.Add(ctx, -1)
 	require.Equal(t, aggregation.ErrNegativeInput, testHandler.Flush())
@@ -118,7 +120,8 @@ func TestInputRangeUpDownCounter(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	counter := Must(meter).NewInt64UpDownCounter("name.sum")
+	counter, err := meter.SyncInt64().UpDownCounter("name.sum")
+	require.NoError(t, err)
 
 	counter.Add(ctx, -1)
 	counter.Add(ctx, -1)
@@ -137,7 +140,8 @@ func TestInputRangeHistogram(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	histogram := Must(meter).NewFloat64Histogram("name.histogram")
+	histogram, err := meter.SyncFloat64().Histogram("name.histogram")
+	require.NoError(t, err)
 
 	histogram.Record(ctx, math.NaN())
 	require.Equal(t, aggregation.ErrNaNInput, testHandler.Flush())
@@ -162,7 +166,8 @@ func TestDisabledInstrument(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	histogram := Must(meter).NewFloat64Histogram("name.disabled")
+	histogram, err := meter.SyncFloat64().Histogram("name.disabled")
+	require.NoError(t, err)
 
 	histogram.Record(ctx, -1)
 	checkpointed := sdk.Collect(ctx)
@@ -175,7 +180,8 @@ func TestRecordNaN(t *testing.T) {
 	ctx := context.Background()
 	meter, _, _, _ := newSDK(t)
 
-	c := Must(meter).NewFloat64Counter("name.sum")
+	c, err := meter.SyncFloat64().Counter("name.sum")
+	require.NoError(t, err)
 
 	require.Nil(t, testHandler.Flush())
 	c.Add(ctx, math.NaN())
@@ -186,7 +192,8 @@ func TestSDKLabelsDeduplication(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	counter := Must(meter).NewInt64Counter("name.sum")
+	counter, err := meter.SyncInt64().Counter("name.sum")
+	require.NoError(t, err)
 
 	const (
 		maxKeys = 21
@@ -277,48 +284,86 @@ func TestObserverCollection(t *testing.T) {
 	meter, sdk, _, processor := newSDK(t)
 	mult := 1
 
-	_ = Must(meter).NewFloat64GaugeObserver("float.gauge.lastvalue", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(float64(mult), attribute.String("A", "B"))
+	gaugeF, err := meter.AsyncFloat64().Gauge("float.gauge.lastvalue")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		gaugeF,
+	}, func(ctx context.Context) {
+		gaugeF.Observe(ctx, float64(mult), attribute.String("A", "B"))
 		// last value wins
-		result.Observe(float64(-mult), attribute.String("A", "B"))
-		result.Observe(float64(-mult), attribute.String("C", "D"))
+		gaugeF.Observe(ctx, float64(-mult), attribute.String("A", "B"))
+		gaugeF.Observe(ctx, float64(-mult), attribute.String("C", "D"))
 	})
-	_ = Must(meter).NewInt64GaugeObserver("int.gauge.lastvalue", func(_ context.Context, result metric.Int64ObserverResult) {
-		result.Observe(int64(-mult), attribute.String("A", "B"))
-		result.Observe(int64(mult))
+	require.NoError(t, err)
+
+	gaugeI, err := meter.AsyncInt64().Gauge("int.gauge.lastvalue")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		gaugeI,
+	}, func(ctx context.Context) {
+		gaugeI.Observe(ctx, int64(-mult), attribute.String("A", "B"))
+		gaugeI.Observe(ctx, int64(mult))
 		// last value wins
-		result.Observe(int64(mult), attribute.String("A", "B"))
-		result.Observe(int64(mult))
+		gaugeI.Observe(ctx, int64(mult), attribute.String("A", "B"))
+		gaugeI.Observe(ctx, int64(mult))
 	})
-
-	_ = Must(meter).NewFloat64CounterObserver("float.counterobserver.sum", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(float64(mult), attribute.String("A", "B"))
-		result.Observe(float64(2*mult), attribute.String("A", "B"))
-		result.Observe(float64(mult), attribute.String("C", "D"))
+	require.NoError(t, err)
+
+	counterF, err := meter.AsyncFloat64().Counter("float.counterobserver.sum")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		counterF,
+	}, func(ctx context.Context) {
+		counterF.Observe(ctx, float64(mult), attribute.String("A", "B"))
+		counterF.Observe(ctx, float64(2*mult), attribute.String("A", "B"))
+		counterF.Observe(ctx, float64(mult), attribute.String("C", "D"))
 	})
-	_ = Must(meter).NewInt64CounterObserver("int.counterobserver.sum", func(_ context.Context, result metric.Int64ObserverResult) {
-		result.Observe(int64(2*mult), attribute.String("A", "B"))
-		result.Observe(int64(mult))
+	require.NoError(t, err)
+
+	counterI, err := meter.AsyncInt64().Counter("int.counterobserver.sum")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		counterI,
+	}, func(ctx context.Context) {
+		counterI.Observe(ctx, int64(2*mult), attribute.String("A", "B"))
+		counterI.Observe(ctx, int64(mult))
 		// last value wins
-		result.Observe(int64(mult), attribute.String("A", "B"))
-		result.Observe(int64(mult))
+		counterI.Observe(ctx, int64(mult), attribute.String("A", "B"))
+		counterI.Observe(ctx, int64(mult))
 	})
-
-	_ = Must(meter).NewFloat64UpDownCounterObserver("float.updowncounterobserver.sum", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(float64(mult), attribute.String("A", "B"))
-		result.Observe(float64(-2*mult), attribute.String("A", "B"))
-		result.Observe(float64(mult), attribute.String("C", "D"))
+	require.NoError(t, err)
+
+	updowncounterF, err := meter.AsyncFloat64().UpDownCounter("float.updowncounterobserver.sum")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		updowncounterF,
+	}, func(ctx context.Context) {
+		updowncounterF.Observe(ctx, float64(mult), attribute.String("A", "B"))
+		updowncounterF.Observe(ctx, float64(-2*mult), attribute.String("A", "B"))
+		updowncounterF.Observe(ctx, float64(mult), attribute.String("C", "D"))
 	})
-	_ = Must(meter).NewInt64UpDownCounterObserver("int.updowncounterobserver.sum", func(_ context.Context, result metric.Int64ObserverResult) {
-		result.Observe(int64(2*mult), attribute.String("A", "B"))
-		result.Observe(int64(mult))
+	require.NoError(t, err)
+
+	updowncounterI, err := meter.AsyncInt64().UpDownCounter("int.updowncounterobserver.sum")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		updowncounterI,
+	}, func(ctx context.Context) {
+		updowncounterI.Observe(ctx, int64(2*mult), attribute.String("A", "B"))
+		updowncounterI.Observe(ctx, int64(mult))
 		// last value wins
-		result.Observe(int64(mult), attribute.String("A", "B"))
-		result.Observe(int64(-mult))
+		updowncounterI.Observe(ctx, int64(mult), attribute.String("A", "B"))
+		updowncounterI.Observe(ctx, int64(-mult))
 	})
+	require.NoError(t, err)
 
-	_ = Must(meter).NewInt64GaugeObserver("empty.gauge.sum", func(_ context.Context, result metric.Int64ObserverResult) {
+	unused, err := meter.AsyncInt64().Gauge("empty.gauge.sum")
+	require.NoError(t, err)
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		unused,
+	}, func(ctx context.Context) {
 	})
+	require.NoError(t, err)
 
 	for mult = 0; mult < 3; mult++ {
 		processor.Reset()
@@ -333,15 +378,15 @@ func TestObserverCollection(t *testing.T) {
 			"int.gauge.lastvalue//":      mult,
 			"int.gauge.lastvalue/A=B/":   mult,
 
-			"float.counterobserver.sum/A=B/": 2 * mult,
+			"float.counterobserver.sum/A=B/": 3 * mult,
 			"float.counterobserver.sum/C=D/": mult,
-			"int.counterobserver.sum//":      mult,
-			"int.counterobserver.sum/A=B/":   mult,
+			"int.counterobserver.sum//":      2 * mult,
+			"int.counterobserver.sum/A=B/":   3 * mult,
 
-			"float.updowncounterobserver.sum/A=B/": -2 * mult,
+			"float.updowncounterobserver.sum/A=B/": -mult,
 			"float.updowncounterobserver.sum/C=D/": mult,
-			"int.updowncounterobserver.sum//":      -mult,
-			"int.updowncounterobserver.sum/A=B/":   mult,
+			"int.updowncounterobserver.sum//":      0,
+			"int.updowncounterobserver.sum/A=B/":   3 * mult,
 		}, processor.Values())
 	}
 }
@@ -351,18 +396,26 @@ func TestCounterObserverInputRange(t *testing.T) {
 	meter, sdk, _, processor := newSDK(t)
 
 	// TODO: these tests are testing for negative values, not for _descending values_. Fix.
-	_ = Must(meter).NewFloat64CounterObserver("float.counterobserver.sum", func(_ context.Context, result metric.Float64ObserverResult) {
-		result.Observe(-2, attribute.String("A", "B"))
+	counterF, _ := meter.AsyncFloat64().Counter("float.counterobserver.sum")
+	err := meter.RegisterCallback([]instrument.Asynchronous{
+		counterF,
+	}, func(ctx context.Context) {
+		counterF.Observe(ctx, -2, attribute.String("A", "B"))
 		require.Equal(t, aggregation.ErrNegativeInput, testHandler.Flush())
-		result.Observe(-1, attribute.String("C", "D"))
+		counterF.Observe(ctx, -1, attribute.String("C", "D"))
 		require.Equal(t, aggregation.ErrNegativeInput, testHandler.Flush())
 	})
-	_ = Must(meter).NewInt64CounterObserver("int.counterobserver.sum", func(_ context.Context, result metric.Int64ObserverResult) {
-		result.Observe(-1, attribute.String("A", "B"))
+	require.NoError(t, err)
+	counterI, _ := meter.AsyncInt64().Counter("int.counterobserver.sum")
+	err = meter.RegisterCallback([]instrument.Asynchronous{
+		counterI,
+	}, func(ctx context.Context) {
+		counterI.Observe(ctx, -1, attribute.String("A", "B"))
 		require.Equal(t, aggregation.ErrNegativeInput, testHandler.Flush())
-		result.Observe(-1)
+		counterI.Observe(ctx, -1)
 		require.Equal(t, aggregation.ErrNegativeInput, testHandler.Flush())
 	})
+	require.NoError(t, err)
 
 	collected := sdk.Collect(ctx)
 
@@ -377,51 +430,43 @@ func TestObserverBatch(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	var floatGaugeObs metric.Float64GaugeObserver
-	var intGaugeObs metric.Int64GaugeObserver
-	var floatCounterObs metric.Float64CounterObserver
-	var intCounterObs metric.Int64CounterObserver
-	var floatUpDownCounterObs metric.Float64UpDownCounterObserver
-	var intUpDownCounterObs metric.Int64UpDownCounterObserver
-
-	var batch = Must(meter).NewBatchObserver(
-		func(_ context.Context, result metric.BatchObserverResult) {
-			result.Observe(
-				[]attribute.KeyValue{
-					attribute.String("A", "B"),
-				},
-				floatGaugeObs.Observation(1),
-				floatGaugeObs.Observation(-1),
-				intGaugeObs.Observation(-1),
-				intGaugeObs.Observation(1),
-				floatCounterObs.Observation(1000),
-				intCounterObs.Observation(100),
-				floatUpDownCounterObs.Observation(-1000),
-				intUpDownCounterObs.Observation(-100),
-			)
-			result.Observe(
-				[]attribute.KeyValue{
-					attribute.String("C", "D"),
-				},
-				floatGaugeObs.Observation(-1),
-				floatCounterObs.Observation(-1),
-				floatUpDownCounterObs.Observation(-1),
-			)
-			result.Observe(
-				nil,
-				intGaugeObs.Observation(1),
-				intGaugeObs.Observation(1),
-				intCounterObs.Observation(10),
-				floatCounterObs.Observation(1.1),
-				intUpDownCounterObs.Observation(10),
-			)
-		})
-	floatGaugeObs = batch.NewFloat64GaugeObserver("float.gauge.lastvalue")
-	intGaugeObs = batch.NewInt64GaugeObserver("int.gauge.lastvalue")
-	floatCounterObs = batch.NewFloat64CounterObserver("float.counterobserver.sum")
-	intCounterObs = batch.NewInt64CounterObserver("int.counterobserver.sum")
-	floatUpDownCounterObs = batch.NewFloat64UpDownCounterObserver("float.updowncounterobserver.sum")
-	intUpDownCounterObs = batch.NewInt64UpDownCounterObserver("int.updowncounterobserver.sum")
+	floatGaugeObs, _ := meter.AsyncFloat64().Gauge("float.gauge.lastvalue")
+	intGaugeObs, _ := meter.AsyncInt64().Gauge("int.gauge.lastvalue")
+	floatCounterObs, _ := meter.AsyncFloat64().Counter("float.counterobserver.sum")
+	intCounterObs, _ := meter.AsyncInt64().Counter("int.counterobserver.sum")
+	floatUpDownCounterObs, _ := meter.AsyncFloat64().UpDownCounter("float.updowncounterobserver.sum")
+	intUpDownCounterObs, _ := meter.AsyncInt64().UpDownCounter("int.updowncounterobserver.sum")
+
+	err := meter.RegisterCallback([]instrument.Asynchronous{
+		floatGaugeObs,
+		intGaugeObs,
+		floatCounterObs,
+		intCounterObs,
+		floatUpDownCounterObs,
+		intUpDownCounterObs,
+	}, func(ctx context.Context) {
+		ab := attribute.String("A", "B")
+		floatGaugeObs.Observe(ctx, 1, ab)
+		floatGaugeObs.Observe(ctx, -1, ab)
+		intGaugeObs.Observe(ctx, -1, ab)
+		intGaugeObs.Observe(ctx, 1, ab)
+		floatCounterObs.Observe(ctx, 1000, ab)
+		intCounterObs.Observe(ctx, 100, ab)
+		floatUpDownCounterObs.Observe(ctx, -1000, ab)
+		intUpDownCounterObs.Observe(ctx, -100, ab)
+
+		cd := attribute.String("C", "D")
+		floatGaugeObs.Observe(ctx, -1, cd)
+		floatCounterObs.Observe(ctx, -1, cd)
+		floatUpDownCounterObs.Observe(ctx, -1, cd)
+
+		intGaugeObs.Observe(ctx, 1)
+		intGaugeObs.Observe(ctx, 1)
+		intCounterObs.Observe(ctx, 10)
+		floatCounterObs.Observe(ctx, 1.1)
+		intUpDownCounterObs.Observe(ctx, 10)
+	})
+	require.NoError(t, err)
 
 	collected := sdk.Collect(ctx)
 
@@ -445,37 +490,6 @@ func TestObserverBatch(t *testing.T) {
 	}, processor.Values())
 }
 
-func TestRecordBatch(t *testing.T) {
-	ctx := context.Background()
-	meter, sdk, _, processor := newSDK(t)
-
-	counter1 := Must(meter).NewInt64Counter("int64.sum")
-	counter2 := Must(meter).NewFloat64Counter("float64.sum")
-	histogram1 := Must(meter).NewInt64Histogram("int64.histogram")
-	histogram2 := Must(meter).NewFloat64Histogram("float64.histogram")
-
-	sdk.RecordBatch(
-		ctx,
-		[]attribute.KeyValue{
-			attribute.String("A", "B"),
-			attribute.String("C", "D"),
-		},
-		counter1.Measurement(1),
-		counter2.Measurement(2),
-		histogram1.Measurement(3),
-		histogram2.Measurement(4),
-	)
-
-	sdk.Collect(ctx)
-
-	require.EqualValues(t, map[string]float64{
-		"int64.sum/A=B,C=D/":         1,
-		"float64.sum/A=B,C=D/":       2,
-		"int64.histogram/A=B,C=D/":   3,
-		"float64.histogram/A=B,C=D/": 4,
-	}, processor.Values())
-}
-
 // TestRecordPersistence ensures that a direct-called instrument that
 // is repeatedly used each interval results in a persistent record, so
 // that its encoded labels will be cached across collection intervals.
@@ -483,7 +497,9 @@ func TestRecordPersistence(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, selector, _ := newSDK(t)
 
-	c := Must(meter).NewFloat64Counter("name.sum")
+	c, err := meter.SyncFloat64().Counter("name.sum")
+	require.NoError(t, err)
+
 	uk := attribute.String("bound", "false")
 
 	for i := 0; i < 100; i++ {
@@ -497,51 +513,58 @@ func TestRecordPersistence(t *testing.T) {
 func TestIncorrectInstruments(t *testing.T) {
 	// The Batch observe/record APIs are susceptible to
 	// uninitialized instruments.
-	var counter metric.Int64Counter
-	var observer metric.Int64GaugeObserver
+	var observer asyncint64.Gauge
 
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
 	// Now try with uninitialized instruments.
-	meter.RecordBatch(ctx, nil, counter.Measurement(1))
-	meter.NewBatchObserver(func(_ context.Context, result metric.BatchObserverResult) {
-		result.Observe(nil, observer.Observation(1))
+	err := meter.RegisterCallback([]instrument.Asynchronous{
+		observer,
+	}, func(ctx context.Context) {
+		observer.Observe(ctx, 1)
 	})
+	require.ErrorIs(t, err, metricsdk.ErrBadInstrument)
 
 	collected := sdk.Collect(ctx)
-	require.Equal(t, metricsdk.ErrUninitializedInstrument, testHandler.Flush())
+	err = testHandler.Flush()
+	require.NoError(t, err)
 	require.Equal(t, 0, collected)
 
 	// Now try with instruments from another SDK.
-	var noopMeter metric.Meter
-	counter = metric.Must(noopMeter).NewInt64Counter("name.sum")
-	observer = metric.Must(noopMeter).NewBatchObserver(
-		func(context.Context, metric.BatchObserverResult) {},
-	).NewInt64GaugeObserver("observer")
-
-	meter.RecordBatch(ctx, nil, counter.Measurement(1))
-	meter.NewBatchObserver(func(_ context.Context, result metric.BatchObserverResult) {
-		result.Observe(nil, observer.Observation(1))
-	})
+	noopMeter := nonrecording.NewNoopMeter()
+	observer, _ = noopMeter.AsyncInt64().Gauge("observer")
+
+	err = meter.RegisterCallback(
+		[]instrument.Asynchronous{observer},
+		func(ctx context.Context) {
+			observer.Observe(ctx, 1)
+		},
+	)
+	require.ErrorIs(t, err, metricsdk.ErrBadInstrument)
 
 	collected = sdk.Collect(ctx)
 	require.Equal(t, 0, collected)
 	require.EqualValues(t, map[string]float64{}, processor.Values())
-	require.Equal(t, metricsdk.ErrUninitializedInstrument, testHandler.Flush())
+
+	err = testHandler.Flush()
+	require.NoError(t, err)
 }
 
 func TestSyncInAsync(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, _, processor := newSDK(t)
 
-	counter := Must(meter).NewFloat64Counter("counter.sum")
-	_ = Must(meter).NewInt64GaugeObserver("observer.lastvalue",
-		func(ctx context.Context, result metric.Int64ObserverResult) {
-			result.Observe(10)
-			counter.Add(ctx, 100)
-		},
-	)
+	counter, _ := meter.SyncFloat64().Counter("counter.sum")
+	gauge, _ := meter.AsyncInt64().Gauge("observer.lastvalue")
+
+	err := meter.RegisterCallback([]instrument.Asynchronous{
+		gauge,
+	}, func(ctx context.Context) {
+		gauge.Observe(ctx, 10)
+		counter.Add(ctx, 100)
+	})
+	require.NoError(t, err)
 
 	sdk.Collect(ctx)
 
diff --git a/sdk/metric/go.mod b/sdk/metric/go.mod
index 1424e5674cf..33fda254764 100644
--- a/sdk/metric/go.mod
+++ b/sdk/metric/go.mod
@@ -16,8 +16,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../../example/zipkin
@@ -43,10 +41,9 @@ replace go.opentelemetry.io/otel/trace => ../../trace
 require (
 	github.com/benbjohnson/clock v1.3.0
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
-	go.opentelemetry.io/otel/internal/metric v0.26.0
-	go.opentelemetry.io/otel/metric v0.26.0
-	go.opentelemetry.io/otel/sdk v1.3.0
+	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel/metric v0.27.0
+	go.opentelemetry.io/otel/sdk v1.4.1
 )
 
 replace go.opentelemetry.io/otel/example/passthrough => ../../example/passthrough
@@ -57,8 +54,6 @@ replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc => ../..
 
 replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp => ../../exporters/otlp/otlptrace/otlptracehttp
 
-replace go.opentelemetry.io/otel/internal/metric => ../../internal/metric
-
 replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric => ../../exporters/otlp/otlpmetric
 
 replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc => ../../exporters/otlp/otlpmetric/otlpmetricgrpc
diff --git a/sdk/metric/sdk.go b/sdk/metric/sdk.go
index ee127e6fa19..db3ad330213 100644
--- a/sdk/metric/sdk.go
+++ b/sdk/metric/sdk.go
@@ -98,7 +98,7 @@ type (
 		// supports checking for no updates during a round.
 		collectedCount int64
 
-		// storage is the stored label set for this record,
+		// labels is the stored label set for this record,
 		// except in cases where a label set is shared due to
 		// batch recording.
 		labels attribute.Set
@@ -183,7 +183,7 @@ func (b *baseInstrument) acquireHandle(kvs []attribute.KeyValue) *record {
 		// an interface here.
 		if actual, loaded := b.meter.current.LoadOrStore(mk, rec); loaded {
 			// Existing record case. Cannot change rec here because if fail
-			// will try to add rec again to avoid new allocationb.
+			// will try to add rec again to avoid new allocations.
 			oldRec := actual.(*record)
 			if oldRec.refMapped.ref() {
 				// At this moment it is guaranteed that the entry is in
@@ -208,6 +208,8 @@ func (b *baseInstrument) acquireHandle(kvs []attribute.KeyValue) *record {
 	}
 }
 
+// RecordOne captures a single synchronous metric event.
+//
 // The order of the input array `kvs` may be sorted after the function is called.
 func (s *syncInstrument) RecordOne(ctx context.Context, num number.Number, kvs []attribute.KeyValue) {
 	h := s.acquireHandle(kvs)
@@ -215,7 +217,9 @@ func (s *syncInstrument) RecordOne(ctx context.Context, num number.Number, kvs [
 	h.captureOne(ctx, num)
 }
 
-// @@@
+// ObserveOne captures a single asynchronous metric event.
+
+// The order of the input array `kvs` may be sorted after the function is called.
 func (a *asyncInstrument) ObserveOne(ctx context.Context, num number.Number, attrs []attribute.KeyValue) {
 	h := a.acquireHandle(attrs)
 	defer h.unbind()
diff --git a/sdk/metric/sdkapi/wrap.go b/sdk/metric/sdkapi/wrap.go
index ec05afc207e..9a4d5b0de14 100644
--- a/sdk/metric/sdkapi/wrap.go
+++ b/sdk/metric/sdkapi/wrap.go
@@ -54,19 +54,19 @@ func UnwrapMeterImpl(m metric.Meter) MeterImpl {
 	return mm.MeterImpl
 }
 
-func (m meter) AsyncFloat64() asyncfloat64.Instruments {
+func (m meter) AsyncFloat64() asyncfloat64.InstrumentProvider {
 	return afMeter{m}
 }
 
-func (m meter) AsyncInt64() asyncint64.Instruments {
+func (m meter) AsyncInt64() asyncint64.InstrumentProvider {
 	return aiMeter{m}
 }
 
-func (m meter) SyncFloat64() syncfloat64.Instruments {
+func (m meter) SyncFloat64() syncfloat64.InstrumentProvider {
 	return sfMeter{m}
 }
 
-func (m meter) SyncInt64() syncint64.Instruments {
+func (m meter) SyncInt64() syncint64.InstrumentProvider {
 	return siMeter{m}
 }
 
diff --git a/sdk/metric/stress_test.go b/sdk/metric/stress_test.go
deleted file mode 100644
index 88f1245ec18..00000000000
--- a/sdk/metric/stress_test.go
+++ /dev/null
@@ -1,502 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// This test is too large for the race detector.  This SDK uses no locks
-// that the race detector would help with, anyway.
-//go:build !race
-// +build !race
-
-package metric
-
-import (
-	"context"
-	"fmt"
-	"math"
-	"math/rand"
-	"runtime"
-	"sort"
-	"strings"
-	"sync"
-	"sync/atomic"
-	"testing"
-	"time"
-
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric"
-	"go.opentelemetry.io/otel/sdk/metric/export"
-	"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
-	"go.opentelemetry.io/otel/sdk/metric/number"
-	"go.opentelemetry.io/otel/sdk/metric/processor/processortest"
-	"go.opentelemetry.io/otel/sdk/metric/sdkapi"
-)
-
-const (
-	concurrencyPerCPU = 100
-	reclaimPeriod     = time.Millisecond * 100
-	testRun           = 5 * time.Second
-	epsilon           = 1e-10
-)
-
-var Must = metric.Must
-
-type (
-	testFixture struct {
-		// stop has to be aligned for 64-bit atomic operations.
-		stop     int64
-		expected sync.Map
-		received sync.Map // Note: doesn't require synchronization
-		wg       sync.WaitGroup
-		impl     testImpl
-		T        *testing.T
-
-		export.AggregatorSelector
-
-		lock  sync.Mutex
-		lused map[string]bool
-
-		dupCheck  map[testKey]int
-		totalDups int64
-	}
-
-	testKey struct {
-		labels     string
-		descriptor *sdkapi.Descriptor
-	}
-
-	testImpl struct {
-		newInstrument  func(meter metric.Meter, name string) SyncImpler
-		getUpdateValue func() number.Number
-		operate        func(interface{}, context.Context, number.Number, []attribute.KeyValue)
-		newStore       func() interface{}
-
-		// storeCollect and storeExpect are the same for
-		// counters, different for lastValues, to ensure we are
-		// testing the timestamps correctly.
-		storeCollect func(store interface{}, value number.Number, ts time.Time)
-		storeExpect  func(store interface{}, value number.Number)
-		readStore    func(store interface{}) number.Number
-		equalValues  func(a, b number.Number) bool
-	}
-
-	SyncImpler interface {
-		SyncImpl() sdkapi.SyncImpl
-	}
-
-	// lastValueState supports merging lastValue values, for the case
-	// where a race condition causes duplicate records.  We always
-	// take the later timestamp.
-	lastValueState struct {
-		// raw has to be aligned for 64-bit atomic operations.
-		raw number.Number
-		ts  time.Time
-	}
-)
-
-func concurrency() int {
-	return concurrencyPerCPU * runtime.NumCPU()
-}
-
-func canonicalizeLabels(ls []attribute.KeyValue) string {
-	copy := append(ls[0:0:0], ls...)
-	sort.SliceStable(copy, func(i, j int) bool {
-		return copy[i].Key < copy[j].Key
-	})
-	var b strings.Builder
-	for _, kv := range copy {
-		b.WriteString(string(kv.Key))
-		b.WriteString("=")
-		b.WriteString(kv.Value.Emit())
-		b.WriteString("$")
-	}
-	return b.String()
-}
-
-func getPeriod() time.Duration {
-	dur := math.Max(
-		float64(reclaimPeriod)/10,
-		float64(reclaimPeriod)*(1+0.1*rand.NormFloat64()),
-	)
-	return time.Duration(dur)
-}
-
-func (f *testFixture) someLabels() []attribute.KeyValue {
-	n := 1 + rand.Intn(3)
-	l := make([]attribute.KeyValue, n)
-
-	for {
-		oused := map[string]bool{}
-		for i := 0; i < n; i++ {
-			var k string
-			for {
-				k = fmt.Sprint("k", rand.Intn(1000000000))
-				if !oused[k] {
-					oused[k] = true
-					break
-				}
-			}
-			l[i] = attribute.String(k, fmt.Sprint("v", rand.Intn(1000000000)))
-		}
-		lc := canonicalizeLabels(l)
-		f.lock.Lock()
-		avail := !f.lused[lc]
-		if avail {
-			f.lused[lc] = true
-			f.lock.Unlock()
-			return l
-		}
-		f.lock.Unlock()
-	}
-}
-
-func (f *testFixture) startWorker(impl *Accumulator, meter metric.Meter, wg *sync.WaitGroup, i int) {
-	ctx := context.Background()
-	name := fmt.Sprint("test_", i)
-	instrument := f.impl.newInstrument(meter, name)
-	var descriptor *sdkapi.Descriptor
-	if ii, ok := instrument.SyncImpl().(*syncInstrument); ok {
-		descriptor = &ii.descriptor
-	}
-	kvs := f.someLabels()
-	clabs := canonicalizeLabels(kvs)
-	dur := getPeriod()
-	key := testKey{
-		labels:     clabs,
-		descriptor: descriptor,
-	}
-	for {
-		sleep := time.Duration(rand.ExpFloat64() * float64(dur))
-		time.Sleep(sleep)
-		value := f.impl.getUpdateValue()
-		f.impl.operate(instrument, ctx, value, kvs)
-
-		actual, _ := f.expected.LoadOrStore(key, f.impl.newStore())
-
-		f.impl.storeExpect(actual, value)
-
-		if atomic.LoadInt64(&f.stop) != 0 {
-			wg.Done()
-			return
-		}
-	}
-}
-
-func (f *testFixture) assertTest(numCollect int) {
-	var allErrs []func()
-	csize := 0
-	f.received.Range(func(key, gstore interface{}) bool {
-		csize++
-		gvalue := f.impl.readStore(gstore)
-
-		estore, loaded := f.expected.Load(key)
-		if !loaded {
-			allErrs = append(allErrs, func() {
-				f.T.Error("Could not locate expected key: ", key)
-			})
-			return true
-		}
-		evalue := f.impl.readStore(estore)
-
-		if !f.impl.equalValues(evalue, gvalue) {
-			allErrs = append(allErrs, func() {
-				f.T.Error("Expected value mismatch: ",
-					evalue, "!=", gvalue, " for ", key)
-			})
-		}
-		return true
-	})
-	rsize := 0
-	f.expected.Range(func(key, value interface{}) bool {
-		rsize++
-		if _, loaded := f.received.Load(key); !loaded {
-			allErrs = append(allErrs, func() {
-				f.T.Error("Did not receive expected key: ", key)
-			})
-		}
-		return true
-	})
-	if rsize != csize {
-		f.T.Error("Did not receive the correct set of metrics: Received != Expected", rsize, csize)
-	}
-
-	for _, anErr := range allErrs {
-		anErr()
-	}
-
-	// Note: It's useful to know the test triggers this condition,
-	// but we can't assert it.  Infrequently no duplicates are
-	// found, and we can't really force a race to happen.
-	//
-	// fmt.Printf("Test duplicate records seen: %.1f%%\n",
-	// 	float64(100*f.totalDups/int64(numCollect*concurrency())))
-}
-
-func (f *testFixture) preCollect() {
-	// Collect calls Process in a single-threaded context. No need
-	// to lock this struct.
-	f.dupCheck = map[testKey]int{}
-}
-
-func (*testFixture) Reader() export.Reader {
-	return nil
-}
-
-func (f *testFixture) Process(accumulation export.Accumulation) error {
-	labels := accumulation.Labels().ToSlice()
-	key := testKey{
-		labels:     canonicalizeLabels(labels),
-		descriptor: accumulation.Descriptor(),
-	}
-	if f.dupCheck[key] == 0 {
-		f.dupCheck[key]++
-	} else {
-		f.totalDups++
-	}
-
-	actual, _ := f.received.LoadOrStore(key, f.impl.newStore())
-
-	agg := accumulation.Aggregator()
-	switch accumulation.Descriptor().InstrumentKind() {
-	case sdkapi.CounterInstrumentKind:
-		sum, err := agg.(aggregation.Sum).Sum()
-		if err != nil {
-			f.T.Fatal("Sum error: ", err)
-		}
-		f.impl.storeCollect(actual, sum, time.Time{})
-	case sdkapi.HistogramInstrumentKind:
-		lv, ts, err := agg.(aggregation.LastValue).LastValue()
-		if err != nil && err != aggregation.ErrNoData {
-			f.T.Fatal("Last value error: ", err)
-		}
-		f.impl.storeCollect(actual, lv, ts)
-	default:
-		panic("Not used in this test")
-	}
-	return nil
-}
-
-func stressTest(t *testing.T, impl testImpl) {
-	ctx := context.Background()
-	t.Parallel()
-	fixture := &testFixture{
-		T:                  t,
-		impl:               impl,
-		lused:              map[string]bool{},
-		AggregatorSelector: processortest.AggregatorSelector(),
-	}
-	cc := concurrency()
-
-	sdk := NewAccumulator(fixture)
-	meter := metric.WrapMeterImpl(sdk)
-	fixture.wg.Add(cc + 1)
-
-	for i := 0; i < cc; i++ {
-		go fixture.startWorker(sdk, meter, &fixture.wg, i)
-	}
-
-	numCollect := 0
-
-	go func() {
-		for {
-			time.Sleep(reclaimPeriod)
-			fixture.preCollect()
-			sdk.Collect(ctx)
-			numCollect++
-			if atomic.LoadInt64(&fixture.stop) != 0 {
-				fixture.wg.Done()
-				return
-			}
-		}
-	}()
-
-	time.Sleep(testRun)
-	atomic.StoreInt64(&fixture.stop, 1)
-	fixture.wg.Wait()
-	fixture.preCollect()
-	sdk.Collect(ctx)
-	numCollect++
-
-	fixture.assertTest(numCollect)
-}
-
-func int64sEqual(a, b number.Number) bool {
-	return a.AsInt64() == b.AsInt64()
-}
-
-func float64sEqual(a, b number.Number) bool {
-	diff := math.Abs(a.AsFloat64() - b.AsFloat64())
-	return diff < math.Abs(a.AsFloat64())*epsilon
-}
-
-// Counters
-
-func intCounterTestImpl() testImpl {
-	return testImpl{
-		newInstrument: func(meter metric.Meter, name string) SyncImpler {
-			return Must(meter).NewInt64Counter(name + ".sum")
-		},
-		getUpdateValue: func() number.Number {
-			for {
-				x := int64(rand.Intn(100))
-				if x != 0 {
-					return number.NewInt64Number(x)
-				}
-			}
-		},
-		operate: func(inst interface{}, ctx context.Context, value number.Number, labels []attribute.KeyValue) {
-			counter := inst.(metric.Int64Counter)
-			counter.Add(ctx, value.AsInt64(), labels...)
-		},
-		newStore: func() interface{} {
-			n := number.NewInt64Number(0)
-			return &n
-		},
-		storeCollect: func(store interface{}, value number.Number, _ time.Time) {
-			store.(*number.Number).AddInt64Atomic(value.AsInt64())
-		},
-		storeExpect: func(store interface{}, value number.Number) {
-			store.(*number.Number).AddInt64Atomic(value.AsInt64())
-		},
-		readStore: func(store interface{}) number.Number {
-			return store.(*number.Number).AsNumberAtomic()
-		},
-		equalValues: int64sEqual,
-	}
-}
-
-func TestStressInt64Counter(t *testing.T) {
-	stressTest(t, intCounterTestImpl())
-}
-
-func floatCounterTestImpl() testImpl {
-	return testImpl{
-		newInstrument: func(meter metric.Meter, name string) SyncImpler {
-			return Must(meter).NewFloat64Counter(name + ".sum")
-		},
-		getUpdateValue: func() number.Number {
-			for {
-				x := rand.Float64()
-				if x != 0 {
-					return number.NewFloat64Number(x)
-				}
-			}
-		},
-		operate: func(inst interface{}, ctx context.Context, value number.Number, labels []attribute.KeyValue) {
-			counter := inst.(metric.Float64Counter)
-			counter.Add(ctx, value.AsFloat64(), labels...)
-		},
-		newStore: func() interface{} {
-			n := number.NewFloat64Number(0.0)
-			return &n
-		},
-		storeCollect: func(store interface{}, value number.Number, _ time.Time) {
-			store.(*number.Number).AddFloat64Atomic(value.AsFloat64())
-		},
-		storeExpect: func(store interface{}, value number.Number) {
-			store.(*number.Number).AddFloat64Atomic(value.AsFloat64())
-		},
-		readStore: func(store interface{}) number.Number {
-			return store.(*number.Number).AsNumberAtomic()
-		},
-		equalValues: float64sEqual,
-	}
-}
-
-func TestStressFloat64Counter(t *testing.T) {
-	stressTest(t, floatCounterTestImpl())
-}
-
-// LastValue
-
-func intLastValueTestImpl() testImpl {
-	return testImpl{
-		newInstrument: func(meter metric.Meter, name string) SyncImpler {
-			return Must(meter).NewInt64Histogram(name + ".lastvalue")
-		},
-		getUpdateValue: func() number.Number {
-			r1 := rand.Int63()
-			return number.NewInt64Number(rand.Int63() - r1)
-		},
-		operate: func(inst interface{}, ctx context.Context, value number.Number, labels []attribute.KeyValue) {
-			histogram := inst.(metric.Int64Histogram)
-			histogram.Record(ctx, value.AsInt64(), labels...)
-		},
-		newStore: func() interface{} {
-			return &lastValueState{
-				raw: number.NewInt64Number(0),
-			}
-		},
-		storeCollect: func(store interface{}, value number.Number, ts time.Time) {
-			gs := store.(*lastValueState)
-
-			if !ts.Before(gs.ts) {
-				gs.ts = ts
-				gs.raw.SetInt64Atomic(value.AsInt64())
-			}
-		},
-		storeExpect: func(store interface{}, value number.Number) {
-			gs := store.(*lastValueState)
-			gs.raw.SetInt64Atomic(value.AsInt64())
-		},
-		readStore: func(store interface{}) number.Number {
-			gs := store.(*lastValueState)
-			return gs.raw.AsNumberAtomic()
-		},
-		equalValues: int64sEqual,
-	}
-}
-
-func TestStressInt64LastValue(t *testing.T) {
-	stressTest(t, intLastValueTestImpl())
-}
-
-func floatLastValueTestImpl() testImpl {
-	return testImpl{
-		newInstrument: func(meter metric.Meter, name string) SyncImpler {
-			return Must(meter).NewFloat64Histogram(name + ".lastvalue")
-		},
-		getUpdateValue: func() number.Number {
-			return number.NewFloat64Number((-0.5 + rand.Float64()) * 100000)
-		},
-		operate: func(inst interface{}, ctx context.Context, value number.Number, labels []attribute.KeyValue) {
-			histogram := inst.(metric.Float64Histogram)
-			histogram.Record(ctx, value.AsFloat64(), labels...)
-		},
-		newStore: func() interface{} {
-			return &lastValueState{
-				raw: number.NewFloat64Number(0),
-			}
-		},
-		storeCollect: func(store interface{}, value number.Number, ts time.Time) {
-			gs := store.(*lastValueState)
-
-			if !ts.Before(gs.ts) {
-				gs.ts = ts
-				gs.raw.SetFloat64Atomic(value.AsFloat64())
-			}
-		},
-		storeExpect: func(store interface{}, value number.Number) {
-			gs := store.(*lastValueState)
-			gs.raw.SetFloat64Atomic(value.AsFloat64())
-		},
-		readStore: func(store interface{}) number.Number {
-			gs := store.(*lastValueState)
-			return gs.raw.AsNumberAtomic()
-		},
-		equalValues: float64sEqual,
-	}
-}
-
-func TestStressFloat64LastValue(t *testing.T) {
-	stressTest(t, floatLastValueTestImpl())
-}
diff --git a/sdk/resource/process.go b/sdk/resource/process.go
index 80d5e699323..c1e5ae90a5b 100644
--- a/sdk/resource/process.go
+++ b/sdk/resource/process.go
@@ -39,7 +39,12 @@ var (
 	defaultExecutablePathProvider executablePathProvider = os.Executable
 	defaultCommandArgsProvider    commandArgsProvider    = func() []string { return os.Args }
 	defaultOwnerProvider          ownerProvider          = user.Current
-	defaultRuntimeNameProvider    runtimeNameProvider    = func() string { return runtime.Compiler }
+	defaultRuntimeNameProvider    runtimeNameProvider    = func() string {
+		if runtime.Compiler == "gc" {
+			return "go"
+		}
+		return runtime.Compiler
+	}
 	defaultRuntimeVersionProvider runtimeVersionProvider = runtime.Version
 	defaultRuntimeOSProvider      runtimeOSProvider      = func() string { return runtime.GOOS }
 	defaultRuntimeArchProvider    runtimeArchProvider    = func() string { return runtime.GOARCH }
diff --git a/sdk/resource/process_test.go b/sdk/resource/process_test.go
index d60c48411c4..0f9c628cc8d 100644
--- a/sdk/resource/process_test.go
+++ b/sdk/resource/process_test.go
@@ -118,7 +118,11 @@ func TestCommandArgs(t *testing.T) {
 }
 
 func TestRuntimeName(t *testing.T) {
-	require.EqualValues(t, runtime.Compiler, resource.RuntimeName())
+	if runtime.Compiler == "gc" {
+		require.EqualValues(t, "go", resource.RuntimeName())
+	} else {
+		require.EqualValues(t, runtime.Compiler, resource.RuntimeName())
+	}
 }
 
 func TestRuntimeOS(t *testing.T) {
diff --git a/sdk/trace/attributesmap.go b/sdk/trace/attributesmap.go
deleted file mode 100644
index b891c8178b7..00000000000
--- a/sdk/trace/attributesmap.go
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package trace // import "go.opentelemetry.io/otel/sdk/trace"
-
-import (
-	"container/list"
-
-	"go.opentelemetry.io/otel/attribute"
-)
-
-// attributesMap is a capped map of attributes, holding the most recent attributes.
-// Eviction is done via a LRU method, the oldest entry is removed to create room for a new entry.
-// Updates are allowed and they refresh the usage of the key.
-//
-// This is based from https://github.com/hashicorp/golang-lru/blob/master/simplelru/lru.go
-// With a subset of the its operations and specific for holding attribute.KeyValue
-type attributesMap struct {
-	attributes   map[attribute.Key]*list.Element
-	evictList    *list.List
-	droppedCount int
-	capacity     int
-}
-
-func newAttributesMap(capacity int) *attributesMap {
-	lm := &attributesMap{
-		attributes: make(map[attribute.Key]*list.Element),
-		evictList:  list.New(),
-		capacity:   capacity,
-	}
-	return lm
-}
-
-func (am *attributesMap) add(kv attribute.KeyValue) {
-	// Check for existing item
-	if ent, ok := am.attributes[kv.Key]; ok {
-		am.evictList.MoveToFront(ent)
-		ent.Value = &kv
-		return
-	}
-
-	// Add new item
-	entry := am.evictList.PushFront(&kv)
-	am.attributes[kv.Key] = entry
-
-	// Verify size not exceeded
-	if am.evictList.Len() > am.capacity {
-		am.removeOldest()
-		am.droppedCount++
-	}
-}
-
-// toKeyValue copies the attributesMap into a slice of attribute.KeyValue and
-// returns it. If the map is empty, a nil is returned.
-// TODO: Is it more efficient to return a pointer to the slice?
-func (am *attributesMap) toKeyValue() []attribute.KeyValue {
-	len := am.evictList.Len()
-	if len == 0 {
-		return nil
-	}
-
-	attributes := make([]attribute.KeyValue, 0, len)
-	for ent := am.evictList.Back(); ent != nil; ent = ent.Prev() {
-		if value, ok := ent.Value.(*attribute.KeyValue); ok {
-			attributes = append(attributes, *value)
-		}
-	}
-
-	return attributes
-}
-
-// removeOldest removes the oldest item from the cache.
-func (am *attributesMap) removeOldest() {
-	ent := am.evictList.Back()
-	if ent != nil {
-		am.evictList.Remove(ent)
-		kv := ent.Value.(*attribute.KeyValue)
-		delete(am.attributes, kv.Key)
-	}
-}
diff --git a/sdk/trace/attributesmap_test.go b/sdk/trace/attributesmap_test.go
deleted file mode 100644
index 90a201e2195..00000000000
--- a/sdk/trace/attributesmap_test.go
+++ /dev/null
@@ -1,103 +0,0 @@
-// Copyright The OpenTelemetry Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package trace
-
-import (
-	"fmt"
-	"testing"
-
-	"go.opentelemetry.io/otel/attribute"
-)
-
-const testKeyFmt = "test-key-%d"
-
-func TestAttributesMap(t *testing.T) {
-	wantCapacity := 128
-	attrMap := newAttributesMap(wantCapacity)
-
-	for i := 0; i < 256; i++ {
-		attrMap.add(attribute.Int(fmt.Sprintf(testKeyFmt, i), i))
-	}
-	if attrMap.capacity != wantCapacity {
-		t.Errorf("attrMap.capacity: got '%d'; want '%d'", attrMap.capacity, wantCapacity)
-	}
-
-	if attrMap.droppedCount != wantCapacity {
-		t.Errorf("attrMap.droppedCount: got '%d'; want '%d'", attrMap.droppedCount, wantCapacity)
-	}
-
-	for i := 0; i < wantCapacity; i++ {
-		key := attribute.Key(fmt.Sprintf(testKeyFmt, i))
-		_, ok := attrMap.attributes[key]
-		if ok {
-			t.Errorf("key %q should be dropped", testKeyFmt)
-		}
-	}
-	for i := wantCapacity; i < 256; i++ {
-		key := attribute.Key(fmt.Sprintf(testKeyFmt, i))
-		_, ok := attrMap.attributes[key]
-		if !ok {
-			t.Errorf("key %q should not be dropped", key)
-		}
-	}
-}
-
-func TestAttributesMapGetOldestRemoveOldest(t *testing.T) {
-	attrMap := newAttributesMap(128)
-
-	for i := 0; i < 128; i++ {
-		attrMap.add(attribute.Int(fmt.Sprintf(testKeyFmt, i), i))
-	}
-
-	attrMap.removeOldest()
-	attrMap.removeOldest()
-	attrMap.removeOldest()
-
-	for i := 0; i < 3; i++ {
-		key := attribute.Key(fmt.Sprintf(testKeyFmt, i))
-		_, ok := attrMap.attributes[key]
-		if ok {
-			t.Errorf("key %q should be removed", key)
-		}
-	}
-}
-
-func TestAttributesMapToKeyValue(t *testing.T) {
-	attrMap := newAttributesMap(128)
-
-	for i := 0; i < 128; i++ {
-		attrMap.add(attribute.Int(fmt.Sprintf(testKeyFmt, i), i))
-	}
-
-	kv := attrMap.toKeyValue()
-
-	gotAttrLen := len(kv)
-	wantAttrLen := 128
-	if gotAttrLen != wantAttrLen {
-		t.Errorf("len(attrMap.attributes): got '%d'; want '%d'", gotAttrLen, wantAttrLen)
-	}
-}
-
-func BenchmarkAttributesMapToKeyValue(b *testing.B) {
-	attrMap := newAttributesMap(128)
-
-	for i := 0; i < 128; i++ {
-		attrMap.add(attribute.Int(fmt.Sprintf(testKeyFmt, i), i))
-	}
-
-	for n := 0; n < b.N; n++ {
-		attrMap.toKeyValue()
-	}
-}
diff --git a/sdk/trace/batch_span_processor.go b/sdk/trace/batch_span_processor.go
index 6a7b9dc31bd..56847d9ccba 100644
--- a/sdk/trace/batch_span_processor.go
+++ b/sdk/trace/batch_span_processor.go
@@ -250,7 +250,7 @@ func (bsp *batchSpanProcessor) exportSpans(ctx context.Context) error {
 	}
 
 	if l := len(bsp.batch); l > 0 {
-		global.Debug("exporting spans", "count", len(bsp.batch), "dropped", bsp.dropped)
+		global.Debug("exporting spans", "count", len(bsp.batch), "total_dropped", atomic.LoadUint32(&bsp.dropped))
 		err := bsp.e.ExportSpans(ctx, bsp.batch)
 
 		// A new batch is always created after exporting, even if the batch failed to be exported.
diff --git a/sdk/trace/benchmark_test.go b/sdk/trace/benchmark_test.go
index 335deaf4fc3..81a06e2f8f9 100644
--- a/sdk/trace/benchmark_test.go
+++ b/sdk/trace/benchmark_test.go
@@ -16,6 +16,7 @@ package trace_test
 
 import (
 	"context"
+	"fmt"
 	"testing"
 	"time"
 
@@ -24,6 +25,28 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
+func BenchmarkSpanSetAttributesOverCapacity(b *testing.B) {
+	tp := sdktrace.NewTracerProvider(
+		sdktrace.WithSpanLimits(sdktrace.SpanLimits{AttributeCountLimit: 1}),
+	)
+	tracer := tp.Tracer("BenchmarkSpanSetAttributesOverCapacity")
+	ctx := context.Background()
+	attrs := make([]attribute.KeyValue, 128)
+	for i := range attrs {
+		key := fmt.Sprintf("key-%d", i)
+		attrs[i] = attribute.Bool(key, true)
+	}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		_, span := tracer.Start(ctx, "/foo")
+		span.SetAttributes(attrs...)
+		span.End()
+	}
+}
+
 func BenchmarkStartEndSpan(b *testing.B) {
 	traceBenchmark(b, "Benchmark StartEndSpan", func(b *testing.B, t trace.Tracer) {
 		ctx := context.Background()
diff --git a/sdk/trace/config.go b/sdk/trace/config.go
index 61a30439251..efea7b302f9 100644
--- a/sdk/trace/config.go
+++ b/sdk/trace/config.go
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 package trace // import "go.opentelemetry.io/otel/sdk/trace"
+import "go.opentelemetry.io/otel/sdk/internal/env"
 
 // SpanLimits represents the limits of a span.
 type SpanLimits struct {
@@ -50,14 +51,29 @@ func (sl *SpanLimits) ensureDefault() {
 	}
 }
 
+func (sl *SpanLimits) parsePotentialEnvConfigs() {
+	sl.AttributeCountLimit = env.IntEnvOr(env.SpanAttributesCountKey, sl.AttributeCountLimit)
+	sl.LinkCountLimit = env.IntEnvOr(env.SpanLinkCountKey, sl.LinkCountLimit)
+	sl.EventCountLimit = env.IntEnvOr(env.SpanEventCountKey, sl.EventCountLimit)
+}
+
 const (
 	// DefaultAttributeCountLimit is the default maximum allowed span attribute count.
+	// If not specified via WithSpanLimits, will try to retrieve the value from
+	// environment variable `OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT`.
+	// If Invalid value (negative or zero) is provided, the default value 128 will be used.
 	DefaultAttributeCountLimit = 128
 
 	// DefaultEventCountLimit is the default maximum allowed span event count.
+	// If not specified via WithSpanLimits, will try to retrieve the value from
+	// environment variable `OTEL_SPAN_EVENT_COUNT_LIMIT`.
+	// If Invalid value (negative or zero) is provided, the default value 128 will be used.
 	DefaultEventCountLimit = 128
 
 	// DefaultLinkCountLimit is the default maximum allowed span link count.
+	// If the value is not specified via WithSpanLimits, will try to retrieve the value from
+	// environment variable `OTEL_SPAN_LINK_COUNT_LIMIT`.
+	// If Invalid value (negative or zero) is provided, the default value 128 will be used.
 	DefaultLinkCountLimit = 128
 
 	// DefaultAttributePerEventCountLimit is the default maximum allowed attribute per span event count.
diff --git a/sdk/trace/provider.go b/sdk/trace/provider.go
index c6b311f9cdc..2de79f03397 100644
--- a/sdk/trace/provider.go
+++ b/sdk/trace/provider.go
@@ -98,6 +98,7 @@ var _ trace.TracerProvider = &TracerProvider{}
 func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
 	o := tracerProviderConfig{}
 
+	o.spanLimits.parsePotentialEnvConfigs()
 	for _, opt := range opts {
 		o = opt.apply(o)
 	}
diff --git a/sdk/trace/provider_test.go b/sdk/trace/provider_test.go
index e2fce31d7f7..0633889bdc2 100644
--- a/sdk/trace/provider_test.go
+++ b/sdk/trace/provider_test.go
@@ -17,8 +17,14 @@ package trace
 import (
 	"context"
 	"errors"
+	"os"
 	"testing"
 
+	"github.com/stretchr/testify/require"
+
+	ottest "go.opentelemetry.io/otel/internal/internaltest"
+	"go.opentelemetry.io/otel/sdk/internal/env"
+
 	"github.com/stretchr/testify/assert"
 
 	"go.opentelemetry.io/otel/trace"
@@ -94,3 +100,58 @@ func TestSchemaURL(t *testing.T) {
 	tracerStruct := tracerIface.(*tracer)
 	assert.EqualValues(t, schemaURL, tracerStruct.instrumentationLibrary.SchemaURL)
 }
+
+func TestNewTraceProviderWithoutSpanLimitConfiguration(t *testing.T) {
+	envStore := ottest.NewEnvStore()
+	defer func() {
+		require.NoError(t, envStore.Restore())
+	}()
+	envStore.Record(env.SpanAttributesCountKey)
+	envStore.Record(env.SpanEventCountKey)
+	envStore.Record(env.SpanLinkCountKey)
+	require.NoError(t, os.Setenv(env.SpanEventCountKey, "111"))
+	require.NoError(t, os.Setenv(env.SpanAttributesCountKey, "222"))
+	require.NoError(t, os.Setenv(env.SpanLinkCountKey, "333"))
+	tp := NewTracerProvider()
+	assert.Equal(t, 111, tp.spanLimits.EventCountLimit)
+	assert.Equal(t, 222, tp.spanLimits.AttributeCountLimit)
+	assert.Equal(t, 333, tp.spanLimits.LinkCountLimit)
+}
+
+func TestNewTraceProviderWithSpanLimitConfigurationFromOptsAndEnvironmentVariable(t *testing.T) {
+	envStore := ottest.NewEnvStore()
+	defer func() {
+		require.NoError(t, envStore.Restore())
+	}()
+	envStore.Record(env.SpanAttributesCountKey)
+	envStore.Record(env.SpanEventCountKey)
+	envStore.Record(env.SpanLinkCountKey)
+	require.NoError(t, os.Setenv(env.SpanEventCountKey, "111"))
+	require.NoError(t, os.Setenv(env.SpanAttributesCountKey, "222"))
+	require.NoError(t, os.Setenv(env.SpanLinkCountKey, "333"))
+	tp := NewTracerProvider(WithSpanLimits(SpanLimits{
+		EventCountLimit:     1,
+		AttributeCountLimit: 2,
+		LinkCountLimit:      3,
+	}))
+	assert.Equal(t, 1, tp.spanLimits.EventCountLimit)
+	assert.Equal(t, 2, tp.spanLimits.AttributeCountLimit)
+	assert.Equal(t, 3, tp.spanLimits.LinkCountLimit)
+}
+
+func TestNewTraceProviderWithInvalidSpanLimitConfigurationFromEnvironmentVariable(t *testing.T) {
+	envStore := ottest.NewEnvStore()
+	defer func() {
+		require.NoError(t, envStore.Restore())
+	}()
+	envStore.Record(env.SpanAttributesCountKey)
+	envStore.Record(env.SpanEventCountKey)
+	envStore.Record(env.SpanLinkCountKey)
+	require.NoError(t, os.Setenv(env.SpanEventCountKey, "-111"))
+	require.NoError(t, os.Setenv(env.SpanAttributesCountKey, "-222"))
+	require.NoError(t, os.Setenv(env.SpanLinkCountKey, "-333"))
+	tp := NewTracerProvider()
+	assert.Equal(t, 128, tp.spanLimits.EventCountLimit)
+	assert.Equal(t, 128, tp.spanLimits.AttributeCountLimit)
+	assert.Equal(t, 128, tp.spanLimits.LinkCountLimit)
+}
diff --git a/sdk/trace/simple_span_processor.go b/sdk/trace/simple_span_processor.go
index d31d3c1caff..e8530a95932 100644
--- a/sdk/trace/simple_span_processor.go
+++ b/sdk/trace/simple_span_processor.go
@@ -116,7 +116,7 @@ func (ssp *simpleSpanProcessor) ForceFlush(context.Context) error {
 	return nil
 }
 
-// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+// MarshalLog is the marshaling function used by the logging system to represent this Span Processor.
 func (ssp *simpleSpanProcessor) MarshalLog() interface{} {
 	return struct {
 		Type     string
diff --git a/sdk/trace/span.go b/sdk/trace/span.go
index bf0c41c1112..779cde691dd 100644
--- a/sdk/trace/span.go
+++ b/sdk/trace/span.go
@@ -54,6 +54,7 @@ type ReadOnlySpan interface {
 	// the span has not ended.
 	EndTime() time.Time
 	// Attributes returns the defining attributes of the span.
+	// The order of the returned attributes is not guaranteed to be stable across invocations.
 	Attributes() []attribute.KeyValue
 	// Links returns all the links the span has to other spans.
 	Links() []Link
@@ -129,9 +130,14 @@ type recordingSpan struct {
 	// spanContext holds the SpanContext of this span.
 	spanContext trace.SpanContext
 
-	// attributes are capped at configured limit. When the capacity is reached
-	// an oldest entry is removed to create room for a new entry.
-	attributes *attributesMap
+	// attributes is a collection of user provided key/values. The collection
+	// is constrained by a configurable maximum held by the parent
+	// TracerProvider. When additional attributes are added after this maximum
+	// is reached these attributes the user is attempting to add are dropped.
+	// This dropped number of attributes is tracked and reported in the
+	// ReadOnlySpan exported when the span ends.
+	attributes        []attribute.KeyValue
+	droppedAttributes int
 
 	// events are stored in FIFO queue capped by configured limit.
 	events evictedQueue
@@ -194,11 +200,80 @@ func (s *recordingSpan) SetStatus(code codes.Code, description string) {
 // will be overwritten with the value contained in attributes.
 //
 // If this span is not being recorded than this method does nothing.
+//
+// If adding attributes to the span would exceed the maximum amount of
+// attributes the span is configured to have, the last added attributes will
+// be dropped.
 func (s *recordingSpan) SetAttributes(attributes ...attribute.KeyValue) {
 	if !s.IsRecording() {
 		return
 	}
-	s.copyToCappedAttributes(attributes...)
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	// If adding these attributes could exceed the capacity of s perform a
+	// de-duplication and truncation while adding to avoid over allocation.
+	if len(s.attributes)+len(attributes) > s.tracer.provider.spanLimits.AttributeCountLimit {
+		s.addOverCapAttrs(attributes)
+		return
+	}
+
+	// Otherwise, add without deduplication. When attributes are read they
+	// will be deduplicated, optimizing the operation.
+	for _, a := range attributes {
+		if !a.Valid() {
+			// Drop all invalid attributes.
+			s.droppedAttributes++
+			continue
+		}
+		s.attributes = append(s.attributes, a)
+	}
+}
+
+// addOverCapAttrs adds the attributes attrs to the span s while
+// de-duplicating the attributes of s and attrs and dropping attributes that
+// exceed the capacity of s.
+//
+// This method assumes s.mu.Lock is held by the caller.
+//
+// This method should only be called when there is a possibility that adding
+// attrs to s will exceed the capacity of s. Otherwise, attrs should be added
+// to s without checking for duplicates and all retrieval methods of the
+// attributes for s will de-duplicate as needed.
+func (s *recordingSpan) addOverCapAttrs(attrs []attribute.KeyValue) {
+	// In order to not allocate more capacity to s.attributes than needed,
+	// prune and truncate this addition of attributes while adding.
+
+	// Do not set a capacity when creating this map. Benchmark testing has
+	// showed this to only add unused memory allocations in general use.
+	exists := make(map[attribute.Key]int)
+	s.dedupeAttrsFromRecord(&exists)
+
+	// Now that s.attributes is deduplicated, adding unique attributes up to
+	// the capacity of s will not over allocate s.attributes.
+	for _, a := range attrs {
+		if !a.Valid() {
+			// Drop all invalid attributes.
+			s.droppedAttributes++
+			continue
+		}
+
+		if idx, ok := exists[a.Key]; ok {
+			// Perform all updates before dropping, even when at capacity.
+			s.attributes[idx] = a
+			continue
+		}
+
+		if len(s.attributes) >= s.tracer.provider.spanLimits.AttributeCountLimit {
+			// Do not just drop all of the remaining attributes, make sure
+			// updates are checked and performed.
+			s.droppedAttributes++
+		} else {
+			s.attributes = append(s.attributes, a)
+			exists[a.Key] = len(s.attributes) - 1
+		}
+	}
 }
 
 // End ends the span. This method does nothing if the span is already ended or
@@ -388,13 +463,45 @@ func (s *recordingSpan) EndTime() time.Time {
 }
 
 // Attributes returns the attributes of this span.
+//
+// The order of the returned attributes is not guaranteed to be stable.
 func (s *recordingSpan) Attributes() []attribute.KeyValue {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	if s.attributes.evictList.Len() == 0 {
-		return []attribute.KeyValue{}
+	s.dedupeAttrs()
+	return s.attributes
+}
+
+// dedupeAttrs deduplicates the attributes of s to fit capacity.
+//
+// This method assumes s.mu.Lock is held by the caller.
+func (s *recordingSpan) dedupeAttrs() {
+	// Do not set a capacity when creating this map. Benchmark testing has
+	// showed this to only add unused memory allocations in general use.
+	exists := make(map[attribute.Key]int)
+	s.dedupeAttrsFromRecord(&exists)
+}
+
+// dedupeAttrsFromRecord deduplicates the attributes of s to fit capacity
+// using record as the record of unique attribute keys to their index.
+//
+// This method assumes s.mu.Lock is held by the caller.
+func (s *recordingSpan) dedupeAttrsFromRecord(record *map[attribute.Key]int) {
+	// Use the fact that slices share the same backing array.
+	unique := s.attributes[:0]
+	for _, a := range s.attributes {
+		if idx, ok := (*record)[a.Key]; ok {
+			unique[idx] = a
+		} else {
+			unique = append(unique, a)
+			(*record)[a.Key] = len(unique) - 1
+		}
 	}
-	return s.attributes.toKeyValue()
+	// s.attributes have element types of attribute.KeyValue. These types are
+	// not pointers and they themselves do not contain pointer fields,
+	// therefore the duplicate values do not need to be zeroed for them to be
+	// garbage collected.
+	s.attributes = unique
 }
 
 // Links returns the links of this span.
@@ -463,7 +570,7 @@ func (s *recordingSpan) addLink(link trace.Link) {
 func (s *recordingSpan) DroppedAttributes() int {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	return s.attributes.droppedCount
+	return s.droppedAttributes
 }
 
 // DroppedLinks returns the number of links dropped by the span due to limits
@@ -513,10 +620,11 @@ func (s *recordingSpan) snapshot() ReadOnlySpan {
 	sd.status = s.status
 	sd.childSpanCount = s.childSpanCount
 
-	if s.attributes.evictList.Len() > 0 {
-		sd.attributes = s.attributes.toKeyValue()
-		sd.droppedAttributeCount = s.attributes.droppedCount
+	if len(s.attributes) > 0 {
+		s.dedupeAttrs()
+		sd.attributes = s.attributes
 	}
+	sd.droppedAttributeCount = s.droppedAttributes
 	if len(s.events.queue) > 0 {
 		sd.events = s.interfaceArrayToEventArray()
 		sd.droppedEventCount = s.events.droppedCount
@@ -544,18 +652,6 @@ func (s *recordingSpan) interfaceArrayToEventArray() []Event {
 	return eventArr
 }
 
-func (s *recordingSpan) copyToCappedAttributes(attributes ...attribute.KeyValue) {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-	for _, a := range attributes {
-		// Ensure attributes conform to the specification:
-		// https://github.com/open-telemetry/opentelemetry-specification/blob/v1.0.1/specification/common/common.md#attributes
-		if a.Valid() {
-			s.attributes.add(a)
-		}
-	}
-}
-
 func (s *recordingSpan) addChild() {
 	if !s.IsRecording() {
 		return
diff --git a/sdk/trace/trace_test.go b/sdk/trace/trace_test.go
index be27ed62041..5ba0015584a 100644
--- a/sdk/trace/trace_test.go
+++ b/sdk/trace/trace_test.go
@@ -419,34 +419,6 @@ func TestSetSpanAttributesOnStart(t *testing.T) {
 	}
 }
 
-func TestSetSpanAttributes(t *testing.T) {
-	te := NewTestExporter()
-	tp := NewTracerProvider(WithSyncer(te), WithResource(resource.Empty()))
-	span := startSpan(tp, "SpanAttribute")
-	span.SetAttributes(attribute.String("key1", "value1"))
-	got, err := endSpan(te, span)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	want := &snapshot{
-		spanContext: trace.NewSpanContext(trace.SpanContextConfig{
-			TraceID:    tid,
-			TraceFlags: 0x1,
-		}),
-		parent: sc.WithRemote(true),
-		name:   "span0",
-		attributes: []attribute.KeyValue{
-			attribute.String("key1", "value1"),
-		},
-		spanKind:               trace.SpanKindInternal,
-		instrumentationLibrary: instrumentation.Library{Name: "SpanAttribute"},
-	}
-	if diff := cmpDiff(got, want); diff != "" {
-		t.Errorf("SetSpanAttributes: -got +want %s", diff)
-	}
-}
-
 func TestSamplerAttributesLocalChildSpan(t *testing.T) {
 	sampler := &testSampler{prefix: "span", t: t}
 	te := NewTestExporter()
@@ -469,72 +441,193 @@ func TestSamplerAttributesLocalChildSpan(t *testing.T) {
 	assert.Equal(t, []attribute.KeyValue{attribute.Int("callCount", 1)}, gotSpan1.Attributes())
 }
 
-func TestSetSpanAttributesOverLimit(t *testing.T) {
-	te := NewTestExporter()
-	tp := NewTracerProvider(WithSpanLimits(SpanLimits{AttributeCountLimit: 2}), WithSyncer(te), WithResource(resource.Empty()))
-
-	span := startSpan(tp, "SpanAttributesOverLimit")
-	span.SetAttributes(
-		attribute.Bool("key1", true),
+func TestSpanSetAttributes(t *testing.T) {
+	attrs := [...]attribute.KeyValue{
+		attribute.String("key1", "value1"),
 		attribute.String("key2", "value2"),
-		attribute.Bool("key1", false), // Replace key1.
-		attribute.Int64("key4", 4),    // Remove key2 and add key4
-	)
-	got, err := endSpan(te, span)
-	if err != nil {
-		t.Fatal(err)
+		attribute.String("key3", "value3"),
+		attribute.String("key4", "value4"),
+		attribute.String("key1", "value5"),
+		attribute.String("key2", "value6"),
+		attribute.String("key3", "value7"),
 	}
+	invalid := attribute.KeyValue{}
 
-	want := &snapshot{
-		spanContext: trace.NewSpanContext(trace.SpanContextConfig{
-			TraceID:    tid,
-			TraceFlags: 0x1,
-		}),
-		parent: sc.WithRemote(true),
-		name:   "span0",
-		attributes: []attribute.KeyValue{
-			attribute.Bool("key1", false),
-			attribute.Int64("key4", 4),
+	tests := []struct {
+		name        string
+		input       [][]attribute.KeyValue
+		wantAttrs   []attribute.KeyValue
+		wantDropped int
+	}{
+		{
+			name:      "array",
+			input:     [][]attribute.KeyValue{attrs[:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name:      "single_value:array",
+			input:     [][]attribute.KeyValue{attrs[:1], attrs[1:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name:      "array:single_value",
+			input:     [][]attribute.KeyValue{attrs[:2], attrs[2:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name:      "single_values",
+			input:     [][]attribute.KeyValue{attrs[:1], attrs[1:2], attrs[2:3]},
+			wantAttrs: attrs[:3],
 		},
-		spanKind:               trace.SpanKindInternal,
-		droppedAttributeCount:  1,
-		instrumentationLibrary: instrumentation.Library{Name: "SpanAttributesOverLimit"},
-	}
-	if diff := cmpDiff(got, want); diff != "" {
-		t.Errorf("SetSpanAttributesOverLimit: -got +want %s", diff)
-	}
-}
 
-func TestSetSpanAttributesWithInvalidKey(t *testing.T) {
-	te := NewTestExporter()
-	tp := NewTracerProvider(WithSpanLimits(SpanLimits{}), WithSyncer(te), WithResource(resource.Empty()))
+		// The tracing specification states:
+		//
+		//   For each unique attribute key, addition of which would result in
+		//   exceeding the limit, SDK MUST discard that key/value pair
+		//
+		// Therefore, adding attributes after the capacity is reached should
+		// result in those attributes being dropped.
 
-	span := startSpan(tp, "SpanToSetInvalidKeyOrValue")
-	span.SetAttributes(
-		attribute.Bool("", true),
-		attribute.Bool("key1", false),
-	)
-	got, err := endSpan(te, span)
-	if err != nil {
-		t.Fatal(err)
-	}
+		{
+			name:        "drop_last_added",
+			input:       [][]attribute.KeyValue{attrs[:3], attrs[3:4], attrs[3:4]},
+			wantAttrs:   attrs[:3],
+			wantDropped: 2,
+		},
 
-	want := &snapshot{
-		spanContext: trace.NewSpanContext(trace.SpanContextConfig{
-			TraceID:    tid,
-			TraceFlags: 0x1,
-		}),
-		parent: sc.WithRemote(true),
-		name:   "span0",
-		attributes: []attribute.KeyValue{
-			attribute.Bool("key1", false),
+		// The tracing specification states:
+		//
+		//   Setting an attribute with the same key as an existing attribute
+		//   SHOULD overwrite the existing attribute's value.
+		//
+		// Therefore, attributes are updated regardless of capacity state.
+
+		{
+			name:      "single_value_update",
+			input:     [][]attribute.KeyValue{attrs[:1], attrs[:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name:      "all_update",
+			input:     [][]attribute.KeyValue{attrs[:3], attrs[4:7]},
+			wantAttrs: attrs[4:7],
+		},
+		{
+			name:      "all_update/multi",
+			input:     [][]attribute.KeyValue{attrs[:3], attrs[4:7], attrs[:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name:      "deduplicate/under_capacity",
+			input:     [][]attribute.KeyValue{attrs[:1], attrs[:1], attrs[:1]},
+			wantAttrs: attrs[:1],
+		},
+		{
+			name:      "deduplicate/over_capacity",
+			input:     [][]attribute.KeyValue{attrs[:1], attrs[:1], attrs[:1], attrs[:3]},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name: "deduplicate/added",
+			input: [][]attribute.KeyValue{
+				attrs[:2],
+				{attrs[2], attrs[2], attrs[2]},
+			},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name: "deduplicate/added_at_cappacity",
+			input: [][]attribute.KeyValue{
+				attrs[:3],
+				{attrs[2], attrs[2], attrs[2]},
+			},
+			wantAttrs: attrs[:3],
+		},
+		{
+			name: "invalid",
+			input: [][]attribute.KeyValue{
+				{invalid},
+			},
+			wantDropped: 1,
+		},
+		{
+			name: "invalid_with_valid",
+			input: [][]attribute.KeyValue{
+				{invalid, attrs[0]},
+			},
+			wantAttrs:   attrs[:1],
+			wantDropped: 1,
+		},
+		{
+			name: "invalid_over_capacity",
+			input: [][]attribute.KeyValue{
+				{invalid, invalid, invalid, invalid, attrs[0]},
+			},
+			wantAttrs:   attrs[:1],
+			wantDropped: 4,
+		},
+		{
+			name: "valid:invalid/under_capacity",
+			input: [][]attribute.KeyValue{
+				attrs[:1],
+				{invalid},
+			},
+			wantAttrs:   attrs[:1],
+			wantDropped: 1,
+		},
+		{
+			name: "valid:invalid/over_capacity",
+			input: [][]attribute.KeyValue{
+				attrs[:1],
+				{invalid, invalid, invalid, invalid},
+			},
+			wantAttrs:   attrs[:1],
+			wantDropped: 4,
+		},
+		{
+			name: "valid_at_capacity:invalid",
+			input: [][]attribute.KeyValue{
+				attrs[:3],
+				{invalid, invalid, invalid, invalid},
+			},
+			wantAttrs:   attrs[:3],
+			wantDropped: 4,
 		},
-		spanKind:               trace.SpanKindInternal,
-		droppedAttributeCount:  0,
-		instrumentationLibrary: instrumentation.Library{Name: "SpanToSetInvalidKeyOrValue"},
 	}
-	if diff := cmpDiff(got, want); diff != "" {
-		t.Errorf("SetSpanAttributesWithInvalidKey: -got +want %s", diff)
+
+	const (
+		capacity = 3
+		instName = "TestSpanAttributeCapacity"
+		spanName = "test span"
+	)
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			te := NewTestExporter()
+			tp := NewTracerProvider(
+				WithSyncer(te),
+				WithSpanLimits(SpanLimits{AttributeCountLimit: capacity}),
+			)
+			_, span := tp.Tracer(instName).Start(context.Background(), spanName)
+			for _, a := range test.input {
+				span.SetAttributes(a...)
+			}
+			span.End()
+
+			require.Implements(t, (*ReadOnlySpan)(nil), span)
+			roSpan := span.(ReadOnlySpan)
+
+			// Ensure the span itself is valid.
+			assert.ElementsMatch(t, test.wantAttrs, roSpan.Attributes(), "exected attributes")
+			assert.Equal(t, test.wantDropped, roSpan.DroppedAttributes(), "dropped attributes")
+
+			snap, ok := te.GetSpan(spanName)
+			require.Truef(t, ok, "span %s not exported", spanName)
+
+			// Ensure the exported span snapshot is valid.
+			assert.ElementsMatch(t, test.wantAttrs, snap.Attributes(), "exected attributes")
+			assert.Equal(t, test.wantDropped, snap.DroppedAttributes(), "dropped attributes")
+		})
 	}
 }
 
@@ -1852,3 +1945,11 @@ func TestWithIDGenerator(t *testing.T) {
 		require.NoError(t, err)
 	}
 }
+
+func TestEmptyRecordingSpanAttributes(t *testing.T) {
+	assert.Nil(t, (&recordingSpan{}).Attributes())
+}
+
+func TestEmptyRecordingSpanDroppedAttributes(t *testing.T) {
+	assert.Equal(t, 0, (&recordingSpan{}).DroppedAttributes())
+}
diff --git a/sdk/trace/tracer.go b/sdk/trace/tracer.go
index b63b4196516..5b8ab43be3d 100644
--- a/sdk/trace/tracer.go
+++ b/sdk/trace/tracer.go
@@ -122,12 +122,19 @@ func (tr *tracer) newRecordingSpan(psc, sc trace.SpanContext, name string, sr Sa
 	}
 
 	s := &recordingSpan{
+		// Do not pre-allocate the attributes slice here! Doing so will
+		// allocate memory that is likely never going to be used, or if used,
+		// will be over-sized. The default Go compiler has been tested to
+		// dynamically allocate needed space very well. Benchmarking has shown
+		// it to be more performant than what we can predetermine here,
+		// especially for the common use case of few to no added
+		// attributes.
+
 		parent:      psc,
 		spanContext: sc,
 		spanKind:    trace.ValidateSpanKind(config.SpanKind()),
 		name:        name,
 		startTime:   startTime,
-		attributes:  newAttributesMap(tr.provider.spanLimits.AttributeCountLimit),
 		events:      newEvictedQueue(tr.provider.spanLimits.EventCountLimit),
 		links:       newEvictedQueue(tr.provider.spanLimits.LinkCountLimit),
 		tracer:      tr,
diff --git a/trace/go.mod b/trace/go.mod
index 1b19ac02308..e7a32932464 100644
--- a/trace/go.mod
+++ b/trace/go.mod
@@ -16,8 +16,6 @@ replace go.opentelemetry.io/otel/example/opencensus => ../example/opencensus
 
 replace go.opentelemetry.io/otel/example/otel-collector => ../example/otel-collector
 
-replace go.opentelemetry.io/otel/example/prom-collector => ../example/prom-collector
-
 replace go.opentelemetry.io/otel/example/prometheus => ../example/prometheus
 
 replace go.opentelemetry.io/otel/example/zipkin => ../example/zipkin
@@ -43,7 +41,7 @@ replace go.opentelemetry.io/otel/trace => ./
 require (
 	github.com/google/go-cmp v0.5.7
 	github.com/stretchr/testify v1.7.0
-	go.opentelemetry.io/otel v1.3.0
+	go.opentelemetry.io/otel v1.4.1
 )
 
 replace go.opentelemetry.io/otel/example/passthrough => ../example/passthrough
diff --git a/trace/tracestate.go b/trace/tracestate.go
index 9fad16fd277..7b7af6955f9 100644
--- a/trace/tracestate.go
+++ b/trace/tracestate.go
@@ -58,7 +58,7 @@ func newMember(key, value string) (member, error) {
 	return member{Key: key, Value: value}, nil
 }
 
-func parseMemeber(m string) (member, error) {
+func parseMember(m string) (member, error) {
 	matches := memberRe.FindStringSubmatch(m)
 	if len(matches) != 5 {
 		return member{}, fmt.Errorf("%w: %s", errInvalidMember, m)
@@ -114,7 +114,7 @@ func ParseTraceState(tracestate string) (TraceState, error) {
 			continue
 		}
 
-		m, err := parseMemeber(memberStr)
+		m, err := parseMember(memberStr)
 		if err != nil {
 			return TraceState{}, wrapErr(err)
 		}
@@ -171,7 +171,8 @@ func (ts TraceState) Get(key string) string {
 // specification an error is returned with the original TraceState.
 //
 // If adding a new list-member means the TraceState would have more members
-// than is allowed an error is returned instead with the original TraceState.
+// then is allowed, the new list-member will be inserted and the right-most
+// list-member will be dropped in the returned TraceState.
 func (ts TraceState) Insert(key, value string) (TraceState, error) {
 	m, err := newMember(key, value)
 	if err != nil {
@@ -179,17 +180,10 @@ func (ts TraceState) Insert(key, value string) (TraceState, error) {
 	}
 
 	cTS := ts.Delete(key)
-	if cTS.Len()+1 > maxListMembers {
-		// TODO (MrAlias): When the second version of the Trace Context
-		// specification is published this needs to not return an error.
-		// Instead it should drop the "right-most" member and insert the new
-		// member at the front.
-		//
-		// https://github.com/w3c/trace-context/pull/448
-		return ts, fmt.Errorf("failed to insert: %w", errMemberNumber)
+	if cTS.Len()+1 <= maxListMembers {
+		cTS.list = append(cTS.list, member{})
 	}
-
-	cTS.list = append(cTS.list, member{})
+	// When the number of members exceeds capacity, drop the "right-most".
 	copy(cTS.list[1:], cTS.list)
 	cTS.list[0] = m
 
diff --git a/trace/tracestate_test.go b/trace/tracestate_test.go
index edb89073de8..784c1589219 100644
--- a/trace/tracestate_test.go
+++ b/trace/tracestate_test.go
@@ -26,74 +26,91 @@ import (
 // Taken from the W3C tests:
 // https://github.com/w3c/trace-context/blob/dcd3ad9b7d6ac36f70ff3739874b73c11b0302a1/test/test_data.json
 var testcases = []struct {
+	name       string
 	in         string
 	tracestate TraceState
 	out        string
 	err        error
 }{
 	{
-		in:  "foo=1,foo=1",
-		err: errDuplicate,
+		name: "duplicate with the same value",
+		in:   "foo=1,foo=1",
+		err:  errDuplicate,
 	},
 	{
-		in:  "foo=1,foo=2",
-		err: errDuplicate,
+		name: "duplicate with different values",
+		in:   "foo=1,foo=2",
+		err:  errDuplicate,
 	},
 	{
-		in:  "foo =1",
-		err: errInvalidMember,
+		name: "improperly formatted key/value pair",
+		in:   "foo =1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "FOO=1",
-		err: errInvalidMember,
+		name: "upper case key",
+		in:   "FOO=1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo.bar=1",
-		err: errInvalidMember,
+		name: "key with invalid character",
+		in:   "foo.bar=1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo@=1,bar=2",
-		err: errInvalidMember,
+		name: "multiple keys, one with empty tenant key",
+		in:   "foo@=1,bar=2",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "@foo=1,bar=2",
-		err: errInvalidMember,
+		name: "multiple keys, one with only tenant",
+		in:   "@foo=1,bar=2",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo@@bar=1,bar=2",
-		err: errInvalidMember,
+		name: "multiple keys, one with double tenant separator",
+		in:   "foo@@bar=1,bar=2",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo@bar@baz=1,bar=2",
-		err: errInvalidMember,
+		name: "multiple keys, one with multiple tenants",
+		in:   "foo@bar@baz=1,bar=2",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
-		err: errInvalidMember,
+		name: "key too long",
+		in:   "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo=1,tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@v=1",
-		err: errInvalidMember,
+		name: "key too long, with tenant",
+		in:   "foo=1,tttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@v=1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo=1,t@vvvvvvvvvvvvvvv=1",
-		err: errInvalidMember,
+		name: "tenant too long",
+		in:   "foo=1,t@vvvvvvvvvvvvvvv=1",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo=bar=baz",
-		err: errInvalidMember,
+		name: "multiple values for a single key",
+		in:   "foo=bar=baz",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "foo=,bar=3",
-		err: errInvalidMember,
+		name: "no value",
+		in:   "foo=,bar=3",
+		err:  errInvalidMember,
 	},
 	{
-		in:  "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32,bar33=33",
-		err: errMemberNumber,
+		name: "too many members",
+		in:   "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32,bar33=33",
+		err:  errMemberNumber,
 	},
 	{
-		in:  "abcdefghijklmnopqrstuvwxyz0123456789_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
-		out: "abcdefghijklmnopqrstuvwxyz0123456789_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+		name: "valid key/value list",
+		in:   "abcdefghijklmnopqrstuvwxyz0123456789_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+		out:  "abcdefghijklmnopqrstuvwxyz0123456789_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
 		tracestate: TraceState{list: []member{
 			{
 				Key:   "abcdefghijklmnopqrstuvwxyz0123456789_-*/",
@@ -102,8 +119,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "abcdefghijklmnopqrstuvwxyz0123456789_-*/@a-z0-9_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
-		out: "abcdefghijklmnopqrstuvwxyz0123456789_-*/@a-z0-9_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+		name: "valid key/value list with tenant",
+		in:   "abcdefghijklmnopqrstuvwxyz0123456789_-*/@a-z0-9_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
+		out:  "abcdefghijklmnopqrstuvwxyz0123456789_-*/@a-z0-9_-*/= !\"#$%&'()*+-./0123456789:;<>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~",
 		tracestate: TraceState{list: []member{
 			{
 				Key:   "abcdefghijklmnopqrstuvwxyz0123456789_-*/@a-z0-9_-*/",
@@ -112,35 +130,40 @@ var testcases = []struct {
 		}},
 	},
 	{
+		name: "empty input",
 		// Empty input should result in no error and a zero value
 		// TraceState being returned, that TraceState should be encoded as an
 		// empty string.
 	},
 	{
-		in:  "foo=1",
-		out: "foo=1",
+		name: "single key and value",
+		in:   "foo=1",
+		out:  "foo=1",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 		}},
 	},
 	{
-		in:  "foo=1,",
-		out: "foo=1",
+		name: "single key and value with empty separator",
+		in:   "foo=1,",
+		out:  "foo=1",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 		}},
 	},
 	{
-		in:  "foo=1,bar=2",
-		out: "foo=1,bar=2",
+		name: "multiple keys and values",
+		in:   "foo=1,bar=2",
+		out:  "foo=1,bar=2",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 			{Key: "bar", Value: "2"},
 		}},
 	},
 	{
-		in:  "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
-		out: "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
+		name: "with a key at maximum length",
+		in:   "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
+		out:  "foo=1,zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz=1",
 		tracestate: TraceState{list: []member{
 			{
 				Key:   "foo",
@@ -153,8 +176,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "foo=1,ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@vvvvvvvvvvvvvv=1",
-		out: "foo=1,ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@vvvvvvvvvvvvvv=1",
+		name: "with a key and tenant at maximum length",
+		in:   "foo=1,ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@vvvvvvvvvvvvvv=1",
+		out:  "foo=1,ttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt@vvvvvvvvvvvvvv=1",
 		tracestate: TraceState{list: []member{
 			{
 				Key:   "foo",
@@ -167,8 +191,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32",
-		out: "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32",
+		name: "with maximum members",
+		in:   "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32",
+		out:  "bar01=01,bar02=02,bar03=03,bar04=04,bar05=05,bar06=06,bar07=07,bar08=08,bar09=09,bar10=10,bar11=11,bar12=12,bar13=13,bar14=14,bar15=15,bar16=16,bar17=17,bar18=18,bar19=19,bar20=20,bar21=21,bar22=22,bar23=23,bar24=24,bar25=25,bar26=26,bar27=27,bar28=28,bar29=29,bar30=30,bar31=31,bar32=32",
 		tracestate: TraceState{list: []member{
 			{Key: "bar01", Value: "01"},
 			{Key: "bar02", Value: "02"},
@@ -205,8 +230,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "foo=1,bar=2,rojo=1,congo=2,baz=3",
-		out: "foo=1,bar=2,rojo=1,congo=2,baz=3",
+		name: "with several members",
+		in:   "foo=1,bar=2,rojo=1,congo=2,baz=3",
+		out:  "foo=1,bar=2,rojo=1,congo=2,baz=3",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 			{Key: "bar", Value: "2"},
@@ -216,8 +242,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "foo=1 \t , \t bar=2, \t baz=3",
-		out: "foo=1,bar=2,baz=3",
+		name: "with tabs between members",
+		in:   "foo=1 \t , \t bar=2, \t baz=3",
+		out:  "foo=1,bar=2,baz=3",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 			{Key: "bar", Value: "2"},
@@ -225,8 +252,9 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "foo=1\t \t,\t \tbar=2,\t \tbaz=3",
-		out: "foo=1,bar=2,baz=3",
+		name: "with multiple tabs between members",
+		in:   "foo=1\t \t,\t \tbar=2,\t \tbaz=3",
+		out:  "foo=1,bar=2,baz=3",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 			{Key: "bar", Value: "2"},
@@ -234,22 +262,25 @@ var testcases = []struct {
 		}},
 	},
 	{
-		in:  "foo=1 ",
-		out: "foo=1",
+		name: "with space at the end of the member",
+		in:   "foo=1 ",
+		out:  "foo=1",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 		}},
 	},
 	{
-		in:  "foo=1\t",
-		out: "foo=1",
+		name: "with tab at the end of the member",
+		in:   "foo=1\t",
+		out:  "foo=1",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 		}},
 	},
 	{
-		in:  "foo=1 \t",
-		out: "foo=1",
+		name: "with tab and space at the end of the member",
+		in:   "foo=1 \t",
+		out:  "foo=1",
 		tracestate: TraceState{list: []member{
 			{Key: "foo", Value: "1"},
 		}},
@@ -269,13 +300,15 @@ var maxMembers = func() TraceState {
 
 func TestParseTraceState(t *testing.T) {
 	for _, tc := range testcases {
-		got, err := ParseTraceState(tc.in)
-		assert.Equal(t, tc.tracestate, got)
-		if tc.err != nil {
-			assert.ErrorIs(t, err, tc.err, tc.in)
-		} else {
-			assert.NoError(t, err, tc.in)
-		}
+		t.Run(tc.name, func(t *testing.T) {
+			got, err := ParseTraceState(tc.in)
+			assert.Equal(t, tc.tracestate, got)
+			if tc.err != nil {
+				assert.ErrorIs(t, err, tc.err, tc.in)
+			} else {
+				assert.NoError(t, err, tc.in)
+			}
+		})
 	}
 }
 
@@ -285,8 +318,9 @@ func TestTraceStateString(t *testing.T) {
 			// Only test non-zero value TraceState.
 			continue
 		}
-
-		assert.Equal(t, tc.out, tc.tracestate.String())
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.out, tc.tracestate.String())
+		})
 	}
 }
 
@@ -296,15 +330,16 @@ func TestTraceStateMarshalJSON(t *testing.T) {
 			// Only test non-zero value TraceState.
 			continue
 		}
+		t.Run(tc.name, func(t *testing.T) {
+			// Encode UTF-8.
+			expected, err := json.Marshal(tc.out)
+			require.NoError(t, err)
 
-		// Encode UTF-8.
-		expected, err := json.Marshal(tc.out)
-		require.NoError(t, err)
-
-		actual, err := json.Marshal(tc.tracestate)
-		require.NoError(t, err)
+			actual, err := json.Marshal(tc.tracestate)
+			require.NoError(t, err)
 
-		assert.Equal(t, expected, actual)
+			assert.Equal(t, expected, actual)
+		})
 	}
 }
 
@@ -332,7 +367,9 @@ func TestTraceStateGet(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		assert.Equal(t, tc.expected, maxMembers.Get(tc.key), tc.name)
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.expected, maxMembers.Get(tc.key))
+		})
 	}
 }
 
@@ -377,7 +414,9 @@ func TestTraceStateDelete(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		assert.Equal(t, tc.expected, ts.Delete(tc.key), tc.name)
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.expected, ts.Delete(tc.key))
+		})
 	}
 }
 
@@ -443,23 +482,31 @@ func TestTraceStateInsert(t *testing.T) {
 			err:        errInvalidKey,
 		},
 		{
-			name:       "too many entries",
+			name:       "drop the right-most member(oldest) in queue",
 			tracestate: maxMembers,
 			key:        "keyx",
 			value:      "valx",
-			expected:   maxMembers,
-			err:        errMemberNumber,
-		},
-	}
+			expected: func() TraceState {
+				// Prepend the new element and remove the oldest one, which is over capacity.
+				return TraceState{
+					list: append(
+						[]member{{Key: "keyx", Value: "valx"}},
+						maxMembers.list[:len(maxMembers.list)-1]...,
+					),
+				}
+			}(),
+		}}
 
 	for _, tc := range testCases {
-		actual, err := tc.tracestate.Insert(tc.key, tc.value)
-		assert.ErrorIs(t, err, tc.err, tc.name)
-		if tc.err != nil {
-			assert.Equal(t, tc.tracestate, actual, tc.name)
-		} else {
-			assert.Equal(t, tc.expected, actual, tc.name)
-		}
+		t.Run(tc.name, func(t *testing.T) {
+			actual, err := tc.tracestate.Insert(tc.key, tc.value)
+			assert.ErrorIs(t, err, tc.err, tc.name)
+			if tc.err != nil {
+				assert.Equal(t, tc.tracestate, actual)
+			} else {
+				assert.Equal(t, tc.expected, actual)
+			}
+		})
 	}
 }
 
diff --git a/version.go b/version.go
index e62acd66e7b..a09bcbb5e8f 100644
--- a/version.go
+++ b/version.go
@@ -16,5 +16,5 @@ package otel // import "go.opentelemetry.io/otel"
 
 // Version is the current release version of OpenTelemetry in use.
 func Version() string {
-	return "1.3.0"
+	return "1.4.1"
 }
diff --git a/versions.yaml b/versions.yaml
index 3e13849987d..3f06f299346 100644
--- a/versions.yaml
+++ b/versions.yaml
@@ -14,7 +14,7 @@
 
 module-sets:
   stable-v1:
-    version: v1.3.0
+    version: v1.4.1
     modules:
       - go.opentelemetry.io/otel
       - go.opentelemetry.io/otel/bridge/opentracing
@@ -34,7 +34,7 @@ module-sets:
       - go.opentelemetry.io/otel/trace
       - go.opentelemetry.io/otel/sdk
   experimental-metrics:
-    version: v0.26.0
+    version: v0.27.0
     modules:
       - go.opentelemetry.io/otel/example/prometheus
       - go.opentelemetry.io/otel/exporters/otlp/otlpmetric
@@ -47,11 +47,11 @@ module-sets:
       - go.opentelemetry.io/otel/sdk/export/metric
       - go.opentelemetry.io/otel/sdk/metric
   experimental-schema:
-    version: v0.0.1
+    version: v0.0.2
     modules:
       - go.opentelemetry.io/otel/schema
   bridge:
-    version: v0.26.0
+    version: v0.27.1
     modules:
       - go.opentelemetry.io/otel/bridge/opencensus
       - go.opentelemetry.io/otel/bridge/opencensus/test
diff --git a/website_docs/libraries.md b/website_docs/libraries.md
index 064af7ba0fc..8cd772da06d 100644
--- a/website_docs/libraries.md
+++ b/website_docs/libraries.md
@@ -92,4 +92,4 @@ A full list of instrumentation libraries available can be found in the [OpenTele
 
 Instrumentation libraries can do things like generate telemetry data for inbound and outbound HTTP requests, but they don't instrument your actual application.
 
-To get richer telemetry data, use [manual instrumentatiion]({{< relref "manual" >}}) to enrich your telemetry data from instrumentation libraries with instrumentation from your running application.
+To get richer telemetry data, use [manual instrumentation]({{< relref "manual" >}}) to enrich your telemetry data from instrumentation libraries with instrumentation from your running application.