Use gRPC ClientConn for otlpmetricgrpc client connection handling (#2425

)

* Use gRPC ClientConn for otlpmetricgrpc conn handling

* Update PR number

* Update otlpmetrichttp to use retry package

* Remove old commented code

* Add all other external changes to changelog

CHANGELOG.md

@@ -13,11 +13,19 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added an internal Logger.
   This can be used by the SDK and API to provide users with feedback of the internal state.
   To enable verbose logs configure the logger which will print V(1) logs. For debugging information configure to print V(5) logs. (#2343)
+- Add the `WithRetry` `Option` and the `RetryConfig` type to the `go.opentelemetry.io/otel/exporter/otel/otlpmetric/otlpmetrichttp` package to specify retry behavior consistently. (#2425)
 
 ### Changed
 
 - The `"go.opentelemetry.io/otel/exporter/otel/otlptrace/otlptracegrpc".Client` now uses the underlying gRPC `ClientConn` to handle name resolution, TCP connection establishment (with retries and backoff) and TLS handshakes, and handling errors on established connections by re-resolving the name and reconnecting. (#2329)
 - Changed the project minimum supported Go version from 1.15 to 1.16. (#2412)
+- The `"go.opentelemetry.io/otel/exporter/otel/otlpmetric/otlpmetricgrpc".Client` now uses the underlying gRPC `ClientConn` to handle name resolution, TCP connection establishment (with retries and backoff) and TLS handshakes, and handling errors on established connections by re-resolving the name and reconnecting. (#2425)
+- The `"go.opentelemetry.io/otel/exporter/otel/otlpmetric/otlpmetricgrpc".RetrySettings` type is renamed to `RetryConfig`. (#2425)
+
+### Deprecated
+
+- Deprecated the `"go.opentelemetry.io/otel/exporter/otel/otlpmetric/otlpmetrichttp".WithMaxAttempts` `Option`, use the new `WithRetry` `Option` instead. (#2425)
+- Deprecated the `"go.opentelemetry.io/otel/exporter/otel/otlpmetric/otlpmetrichttp".WithBackoff` `Option`, use the new `WithRetry` `Option` instead. (#2425)
 
 ### Removed
 

exporters/otlp/otlpmetric/go.mod

@@ -12,7 +12,6 @@ require (
 	go.opentelemetry.io/otel/sdk/export/metric v0.25.0
 	go.opentelemetry.io/otel/sdk/metric v0.25.0
 	go.opentelemetry.io/proto/otlp v0.11.0
-	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013
 	google.golang.org/grpc v1.42.0
 	google.golang.org/protobuf v1.27.1
 )