spec-compliance-matrix.md

Compliance of Implementations with Specification

The following tables show which features are implemented by each OpenTelemetry language implementation.

+ means the feature is supported, - means it is not supported, N/A means the feature is not applicable to the particular language, blank cell means the status of the feature is not known.

For the Optional column, X means the feature is optional, blank means the feature is required, and columns marked with * mean that for each type of exporter (OTLP and Zipkin), implementing at least one of the supported formats is required. Implementing more than one format is optional.

Traces

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
TracerProvider
Create TracerProvider		+	+	+	+	+	+	+	+	+	+	+
Get a Tracer		+	+	+	+	+	+	+	+	+	+	+
Get a Tracer with schema_url		+	+		+			+		+
Get a Tracer with scope attributes								+		+
Associate Tracer with InstrumentationScope					+			+
Safe for concurrent calls		+	+	+	+	+	+	+	+	+	+	+
Shutdown (SDK only required)		+	+	+	+	+	+	+	+	+	+	+
ForceFlush (SDK only required)		+	+	-	+	+	+	+	+	+	+	+
Trace / Context interaction
Get active Span		N/A	+	+	+	+	+	+	+	+	+	+
Set active Span		N/A	+	+	+	+	+	+	+	+	+	+
Tracer	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Create a new Span		+	+	+	+	+	+	+	+	+	+	+
Documentation defines adding attributes at span creation as preferred					+	+		+			+
Get active Span		N/A	+	+	+	+	+	+	+	+	+	+
Mark Span active		N/A	+	+	+	+	+	+	+	+	+	+
Safe for concurrent calls		+	+	+	+	+	+	+	+	+	+	+
SpanContext
IsValid		+	+	+	+	+	+	+	+	+	+	+
IsRemote		+	+	+	+	+	+	+	+	+	+	+
Conforms to the W3C TraceContext spec		+	+	+	+	+	+	+	+	+	+	+
Span	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Create root span		+	+	+	+	+	+	+	+	+	+	+
Create with default parent (active span)		N/A	+	+	+	+	+	+	+	+	+	+
Create with parent from Context		+	+	+	+	+	+	+	+	+	+	+
No explicit parent Span/SpanContext allowed		+	+	+	+	+	+	+	+	+	-	+
SpanProcessor.OnStart receives parent Context		+	+	+	+	+	+	+	+	-	-	+
UpdateName		+	+	+	+	+	+	+	+	+	+	+
User-defined start timestamp		+	+	+	+	+	+	+	+	+	+	+
End		+	+	+	+	+	+	+	+	+	+	+
End with timestamp		+	+	+	+	+	+	+	+	+	+	+
IsRecording		+	+	+	+	+	+	+	+	+	+	+
IsRecording becomes false after End		+	+	+	+	+	+	+	+	+	-	+
Set status with StatusCode (Unset, Ok, Error)		+	+	+	+	+	+	+	+	+	+	+
Safe for concurrent calls		+	+	+	+	+	+	+	+	+	+	+
events collection size limit		+	+	+	+	+	+	+	+	-	-	+
attribute collection size limit		+	+	+	+	+	+	+	+	-	-	+
links collection size limit		+	+	+	+	+	+	+	+	-	-	+
Span attributes	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
SetAttribute		+	+	+	+	+	+	+	+	+	+	+
Set order preserved	X	+	-	+	+	+	+	+	+	+	+	+
String type		+	+	+	+	+	+	+	+	+	+	+
Boolean type		+	+	+	+	+	+	+	+	+	+	+
Double floating-point type		+	+	+	+	+	+	-	+	+	+	+
Signed int64 type		+	+	+	+	+	+	-	+	+	+	+
Array of primitives (homogeneous)		+	+	+	+	+	+	+	+	+	+	+
null values documented as invalid/undefined		+	+	+	+	+	N/A	+		+		N/A
Unicode support for keys and string values		+	+	+	+	+	+	+	+	+	+	+
Span linking	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Links can be recorded on span creation		+	+		+	+	+	+	+	+	+
Links can be recorded after span creation		+								+
Links order is preserved		+	+		+	+	+	+	+	+	+
Span events
AddEvent		+	+	+	+	+	+	+	+	+	+	+
Add order preserved		+	+	+	+	+	+	+	+	+	+	+
Safe for concurrent calls		+	+	+	+	+	+	+	+	+	+	+
Span exceptions
RecordException		-	+	+	+	+	+	+	+	-	+	-
RecordException with extra parameters		-	+	+	+	+	+	+	+	-	+	-
Sampling	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Allow samplers to modify tracestate		+	+		+	+	+	+	+	+	+	+
ShouldSample gets full parent Context		+	+	+	+	+	+	+	+	+	-	+
Sampler: JaegerRemoteSampler		+	+						+
New Span ID created also for non-recording Spans		+	+		+	+	+	+	+	+	-	+
IdGenerators		+	+		+	+	+	+	+	+		+
SpanLimits	X	+	+		+	+	+	+		-		+
Built-in SpanProcessors implement ForceFlush spec			+		+	+	+	+	+	+	+
Attribute Limits	X		+		+	+	+	+
Fetch InstrumentationScope from ReadableSpan			+		+			+

Baggage

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Basic support		+	+	+	+	+	+	+	+	+	+	+
Use official header name baggage		+	+	+	+	+	+	+	+	+	+	+

Metrics

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
The API provides a way to set and get a global default MeterProvider.	X	+	+	+	+		+	+	+	+	-
It is possible to create any number of MeterProviders.	X	+	+	+	+		+	+	+	+	+
MeterProvider provides a way to get a Meter.		+	+	+	+		+	+	+	+	-
get_meter accepts name, version and schema_url.		+	+	+	+		+	+	+	+	-
get_meter accepts attributes.								+	+	+
When an invalid name is specified a working Meter implementation is returned as a fallback.		+	+	+	+		+		+	+	-
The fallback Meter name property keeps its original invalid value.	X	-	-	+	+		+		+	-	-
Associate Meter with InstrumentationScope.			+	+	+		+		+	+
Counter instrument is supported.		+	+	+	+		+	+	+	+	+
AsynchronousCounter instrument is supported.		+	+	+	+		+	+	+	+	+
Histogram instrument is supported.		+	+	+	+		+	+	+	+	+
AsynchronousGauge instrument is supported.		+	+	+	+		+	+	+	+	+
UpDownCounter instrument is supported.		+	+	+	+		+	+	+	+	+
AsynchronousUpDownCounter instrument is supported.		+	+	+	+		+	+	+	+	+
Instruments have name		+	+	+	+		+	+	+	+	+
Instruments have kind.		+	+	+	+		+	+	+	+	+
Instruments have an optional unit of measure.		+	+	+	+		+	+	+	+	+
Instruments have an optional description.		+	+	+	+		+	+	+	+	+
A valid instrument MUST be created and warning SHOULD be emitted when multiple instruments are registered under the same Meter using the same name.			+	+	+		+
Duplicate instrument registration name conflicts are resolved by using the first-seen for the stream name.			+				+
It is possible to register two instruments with same name under different Meters.		+	+	+	+		+		+	+	+
Instrument names conform to the specified syntax.		+	+	+	+		+			+
Instrument units conform to the specified syntax.		-	+		+		-		+	+	+
Instrument descriptions conform to the specified syntax.		-	+		-		-			-	+
Instrument supports the advisory ExplicitBucketBoundaries parameter.			+				+
Instrument supports the advisory Attributes parameter.			+				-
All methods of MeterProvider are safe to be called concurrently.		+	+	+	-		+			+	+
All methods of Meter are safe to be called concurrently.		+	+	+	-		+			+	+
All methods of any instrument are safe to be called concurrently.		+	+	+	-		+			+	+
MeterProvider allows a Resource to be specified.		+	+	+	+			+	+	+	+
A specified Resource can be associated with all the produced metrics from any Meter from the MeterProvider.		+	+	+	+			+	+	+	+
The supplied name, version and schema_url arguments passed to the MeterProvider are used to create an InstrumentationLibrary instance stored in the Meter.		+	-		+				+	+	-
The supplied name, version and schema_url arguments passed to the MeterProvider are used to create an InstrumentationScope instance stored in the Meter.			+	+			+	+	+	+
Configuration is managed solely by the MeterProvider.		+	+	+	+		+	+	+	+	+
The MeterProvider provides methods to update the configuration	X	-	-	-	+		-			-	+
The updated configuration applies to all already returned Meters.	if above	-	-	-	-		-			-	+
There is a way to register Views with a MeterProvider.		-	+	+	+		+	+	+	+	+
The View instrument selection criteria is as specified.			+	+	+		+	+	+	+	+
The View instrument selection criteria supports wildcards.	X		+	+	+		-		+	+	+
The View instrument selection criteria supports the match-all wildcard.			+	+	+		+		+	+	+
The View instrument selection criteria supports a unit.		+			+		+		+
The name of the View can be specified.			+	+	+		+	+		+	+
The View allows configuring the name description, attributes keys and aggregation of the resulting metric stream.			+	+	+		+	+	+	+	-
The View allows configuring the exemplar reservoir of resulting metric stream.	X		-		-		-				-
The SDK allows more than one View to be specified per instrument.	X		+	+	+		+		+	+	+
The Drop aggregation is available.		+	+	+	+		+		+	+	+
The Drop aggregation drops all measurements and does not produce a metric stream.		+	+	+	+		+		+	-	+
The Default aggregation is available.		+	+	+	+		+		+	+	+
The Default aggregation uses the specified aggregation by instrument.		+	+	+	+		+		+	+	+
The Sum aggregation is available.		+	+	+	+		+	+	+	+	+
The Sum aggregation performs as specified.		+	+	+	+		+	+	+	+	+
The LastValue aggregation is available.		+	+	+	+		+	+	+	+	+
The LastValue aggregation performs as specified.		+	+	+	+		+	+	+	+	+
The ExplicitBucketHistogram aggregation is available.		-	+	+	+		+	+	+	+	+
The ExplicitBucketHistogram aggregation performs as specified.		-	+	+	+		+	+	+	+	+
The ExponentialBucketHistogram aggregation is available.											+
The ExponentialBucketHistogram aggregation performs as specified.											+
The metrics Reader implementation supports registering metric Exporters			+	+	+		+	+	+	+	+
The metrics Reader implementation supports configuring the default aggregation on the basis of instrument kind.			+		+		+			-	-
The metrics Reader implementation supports configuring the default temporality on the basis of instrument kind.			+	+	+		+		+	+
The metrics Exporter has access to the aggregated metrics data (aggregated points, not raw measurements).		+	+	+	+		+		+	+	+
The metrics Exporter export function can not be called concurrently from the same Exporter instance.		+	+	+	-		+			+	+
The metrics Exporter export function does not block indefinitely.		+	+	+	-		+			+	+
The metrics Exporter export function receives a batch of metrics.		+	+	+	+		+	+	+	+	+
The metrics Exporter export function returns Success or Failure.		+	+	+	+		+	+	+	+	+
The metrics Exporter provides a ForceFlush function.		-	+	+	-		+	+	+	+	+
The metrics Exporter ForceFlush can inform the caller whether it succeeded, failed or timed out.			+	+	-		+	+		+	+
The metrics Exporter provides a shutdown function.		+	+	+	-		+	+	+	+	+
The metrics Exporter shutdown function do not block indefinitely.		+	+	+	-		+			+	+
The metrics SDK samples Exemplars from measurements.			+		-		+				-
Exemplar sampling can be disabled.			-		-		+				-
The metrics SDK supports SDK-wide exemplar filter configuration			+		-		+				-
The metrics SDK supports TraceBased exemplar filter			+		-		+				-
The metrics SDK supports AlwaysOn exemplar filter			+		-		+				-
The metrics SDK supports AlwaysOff exemplar filter			+		-		+				-
Exemplars retain any attributes available in the measurement that are not preserved by aggregation or view configuration.			+		-		+				-
Exemplars contain the associated trace id and span id of the active span in the Context when the measurement was taken.			+		-		+				-
Exemplars contain the timestamp when the measurement was taken.			+		-		+				-
The metrics SDK provides an ExemplarReservoir interface or extension point.			-		-		+	+			-
An ExemplarReservoir has an offer method with access to the measurement value, attributes, Context and timestamp.			-		-		+	+			-
The metrics SDK provides a SimpleFixedSizeExemplarReservoir that is used by default for all aggregations except ExplicitBucketHistogram.			+		-		+	+			-
The metrics SDK provides an AlignedHistogramBucketExemplarReservoir that is used by default for ExplicitBucketHistogram aggregation.			+		-		+				-
A metric Producer accepts an optional metric Filter							-
The metric Reader implementation supports registering metric Filter and passing them its registered metric Producers							-
The metric SDK's metric Producer implementations uses the metric Filter							-

Logs

Features for the Logging SDK. Disclaimer: this list of features is still a work in progress, please refer to the specification if in any doubt.

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
LoggerProvider.Get Logger			+					+		+	-
LoggerProvider.Get Logger accepts attributes								+		+
LoggerProvider.Shutdown			+					+			-
LoggerProvider.ForceFlush			+					+			-
Logger.Emit(LogRecord)			+					+		+	-
SimpleLogRecordProcessor			+					+		+
BatchLogRecordProcessor			+					+		+
Can plug custom LogRecordProcessor			+					+		+
OTLP/gRPC exporter			+		+			+		+	+
OTLP/HTTP exporter			+		+			+		+	+
OTLP File exporter			-		-						-
Can plug custom LogRecordExporter			+					+		+
Trace Context Injection			+		+			+		+	+

Events

Features for the Events API and the Events SDK. Disclaimer: Events are currently an experimental work in progress.

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
EventLoggerProvider
Get EventLogger
Get EventLogger accepts version	+
Get EventLogger accepts schema_url	+
Get EventLogger accepts attributes	+
EventLogger
Emit event accepts name
Emit event accepts AnyValue body	+
Emit event accepts severity	+
Emit event accepts timestamp	+
Emit event accepts attributes	+
Emit event accepts context	+

Resource

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Create from Attributes		+	+	+	+	+	+	+	+	+	+	+
Create empty		+	+	+	+	+	+	+	+	+	+	+
Merge (v2)		+	+		+	+	+	+	+	+	+
Retrieve attributes		+	+	+	+	+	+	+	+	+	+	+
Default value for service.name		+	+		+	+	+	+		+	+
Resource detector interface/mechanism		+	+	+	+	+	+	+	+	+	+	+
Resource detectors populate Schema URL		+	+				-	+			-

Context Propagation

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Create Context Key		+	+	+	+	+	+	+	+	+	+	+
Get value from Context		+	+	+	+	+	+	+	+	+	+	+
Set value for Context		+	+	+	+	+	+	+	+	+	+	+
Attach Context		N/A	+	+	+	+	+	+	+	+	-	-
Detach Context		N/A	+	+	+	+	+	+	+	+	-	-
Get current Context		N/A	+	+	+	+	+	+	+	+	+	+
Composite Propagator		+	+	+	+	+	+	+	+	+	+	+
Global Propagator		+	+	+	+	+	+	+	+	+	+	+
TraceContext Propagator		+	+	+	+	+	+	+	+	+	+	+
B3 Propagator		+	+	+	+	+	+	+	+	+	+	+
Jaeger Propagator		+	+	+	+	+	+	+	+	+	-	+
OT Propagator		+	+	+	+
OpenCensus Binary Propagator		+
TextMapPropagator		+	+			+		+
Fields		+	+	+	+	+	+	+	+	+	+	+
Setter argument	X	N/A	+	+	+	+	+	+	N/A	+	+	+
Getter argument	X	N/A	+	+	+	+	+	+	N/A	+	+	+
Getter argument returning Keys	X	N/A	+	+	+	+	+	+	N/A	+	-	+

Environment Variables

Note: Support for environment variables is optional.

Feature	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
OTEL_SDK_DISABLED	-	+	-	-	-	-	+	-	-	-	-
OTEL_RESOURCE_ATTRIBUTES	+	+	+	+	+	+	+	+	+	+	-
OTEL_SERVICE_NAME	+	+	+	+	+	+	+		+	+
OTEL_LOG_LEVEL	-	-	+	-	+	-	+		-	-	-
OTEL_PROPAGATORS	-	+		+	+	+	+	-	-	-	-
OTEL_BSP_*	+	+	+	+	+	+	+	+	-	+	-
OTEL_BLRP_*		+						+		+
OTEL_EXPORTER_OTLP_*	+	+		+	+	+	+	+	+	+	-
OTEL_EXPORTER_ZIPKIN_*	-	+		+	+	-	+	-	-	+	-
OTEL_TRACES_EXPORTER	-	+	+	+	+	+	+	-	-	-
OTEL_METRICS_EXPORTER	-	+		+	-	-	+	-	-	-	-
OTEL_LOGS_EXPORTER	-	+		+			+			-
OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT	+	+	+	+	+	+	+	+	-	+
OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT	+	+	+	+	+	+	+			+
OTEL_SPAN_EVENT_COUNT_LIMIT	+	+	+	+	+	+	+	+	-	+
OTEL_SPAN_LINK_COUNT_LIMIT	+	+	+	+	+	+	+	+	-	+
OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT	+	-		+	+	+	+			+
OTEL_LINK_ATTRIBUTE_COUNT_LIMIT	+	-		+	+	+	+			+
OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT							+
OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT							+
OTEL_TRACES_SAMPLER	+	+	+	+	+	+	+	-	-	-
OTEL_TRACES_SAMPLER_ARG	+	+	+	+	+	+	+	-	-	-
OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT	+	+	+	+	+	-	+			+
OTEL_ATTRIBUTE_COUNT_LIMIT	+	+	+	+	+	-	+			+
OTEL_METRIC_EXPORT_INTERVAL	-	+					+			+
OTEL_METRIC_EXPORT_TIMEOUT	-	-					+			+
OTEL_METRICS_EXEMPLAR_FILTER	-	+					+			-
OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE	-	+	+	+			+			+
OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION		+
OTEL_EXPERIMENTAL_CONFIG_FILE

File Configuration

See File Configuration for details.

Feature	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Parse a configuration file
The Parse operation accepts the configuration YAML file format
The Parse operation performs environment variable substitution
The Parse operation returns configuration model
The Parse operation resolves extension component configuration to properties
Create SDK components
The Create operation accepts configuration model
The Create operation returns TracerProvider
The Create operation returns MeterProvider
The Create operation returns LoggerProvider
The Create operation returns Propagators
The Create operation calls CreatePlugin of corresponding ComponentProvider when encountering extension components
Register a ComponentProvider

Exporters

Feature	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Exporter interface			+		+	+	+	+	+	+	+
Exporter interface has ForceFlush			+		-	+	+	+	-		+
Standard output (logging)		+	+	+	+	+	+	+	+	+	+	+
In-memory (mock exporter)		+	+	+	+	+	+	+	-	+	+	+
OTLP
OTLP/gRPC Exporter	*	+	+	+	+		+	+	+	+	+	+
OTLP/HTTP binary Protobuf Exporter	*	+	+	+	+	+	+	+	+	+	+	-
OTLP/HTTP JSON Protobuf Exporter		+	-	+	-		-	+		+	-	-
OTLP/HTTP gzip Content-Encoding support	X	+	+	+	+	+	-	+		-	-	-
Concurrent sending		-	+	+	-		-		+	-	-	-
Honors retryable responses with backoff	X	+	-	+	+	+	-			-	-	-
Honors non-retryable responses	X	+	-	-	+	+	-			-	-	-
Honors throttling response	X	+	-	-	+	+	-			-	-	-
Multi-destination spec compliance	X	+	-		-		-			-	-	-
SchemaURL in ResourceSpans and ScopeSpans		+	+		+		+	+			-
SchemaURL in ResourceMetrics and ScopeMetrics			+		+		-	+			-
SchemaURL in ResourceLogs and ScopeLogs			+		+		-	+			-
Honors the user agent spec								+			+
Partial Success messages are handled and logged for OTLP/gRPC	X	+						+
Partial Success messages are handled and logged for OTLP/HTTP	X	+						+
Zipkin	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Zipkin V1 JSON	X	-	+		+	-	-	-	-	-	-	-
Zipkin V1 Thrift	X	-	+		-	-	-	-	-	-	-	-
Zipkin V2 JSON	*	+	+		+	+	-	+	+	+	+	+
Zipkin V2 Protobuf	*	-	+		+	-	+	-	-	-	-	-
Service name mapping		+	+	+	+	+	+	+	+	+	+	+
SpanKind mapping		+	+	+	+	+	+	+	+	+	+	+
InstrumentationLibrary mapping		+	+	-	+	+	-	+	+	+	+	+
InstrumentationScope mapping			+
Boolean attributes		+	+	+	+	+	+	+	+	+	+	+
Array attributes		+	+	+	+	+	+	+	+	+	+	+
Status mapping		+	+	+	+	+	+	+	+	+	+	+
Error Status mapping		+	+		+	+	-	+	+	+	+	-
Event attributes mapping to Annotations		+	+	+	+	+	+	+	+	+	+	+
Integer microseconds in timestamps		N/A	+		+	+	-	+	+	+	+	+
Prometheus	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Metadata Deduplication		+	+	-	-	-	-	-	+	-	-	-
Name Sanitization		+	+	+	+	-	-	-	+	+	+	+
UNIT Metadata	X	-	-	+	+	-	-	-	-	-	+	-
Unit Suffixes	X	+	+	-	+	-	-	-	+	+	+	-
Unit Full Words	X	+	+	-	-	-	-	-	+	-	-	-
HELP Metadata		+	+	+	+	-	-	-	+	+	+	+
TYPE Metadata		+	+	+	+	-	-	-	+	+	+	+
otel_scope_name and otel_scope_version labels on all Metrics		+	+	-	-	-	-	-	+	-	-	-
otel_scope_info metric	X	+	+	-	-	-	-	-	+	-	-	-
otel_scope_info and labels can be disabled	X	+	-	-	-	-	-	-	+	-	-	-
Gauges become Prometheus Gauges		+	+	+	+	-	-	-	+	+	+	-
Cumulative Monotonic Sums become Prometheus Counters		+	+	+	+	-	-	-	+	+	+	+
Prometheus Counters have _total suffix by default		+	+	+	+	-	-	-	+	-	-	-
Prometheus Counters _total suffixing can be disabled	X	+	-	-	-	-	-	-	-	-	-	-
Cumulative Non-Monotonic Sums become Prometheus Gauges		+	+	+	+	-	-	-	+	+	+	-
Delta Non-Monotonic Sums become Cumulative Prometheus Counters	X	-	-	-	-	-	-	-	-	-	-	-
Cumulative Histograms become Prometheus Histograms		+	+	+	+	-	-	-	+	+	+	+
Delta Histograms become Cumulative Prometheus Histograms	X	-	-	-	-	-	-	-	-	-	-	-
Attributes Keys are Sanitized		+	+	+	+	-	-	-	+	+	+	+
Colliding sanitized attribute keys are merged		+	+	-	-	-	-	-	+	-	-	-
Exemplars for Histograms and Monotonic sums	X	-	-	-	-	-	-	-	-	-	-	-
target_info metric from Resource	X	+	+	+	+	-	-	-	+	-	-	-

OpenCensus Compatibility

Languages not covered by the OpenCensus project, or that did not reach Alpha, are not listed here.

Feature	Go	Java	JS	Python	C++	.NET	Erlang
Trace Bridge	+	+	+	+	-	-	-
Metric Bridge	+	+	-	-	-	-	-

OpenTracing Compatibility

Languages not covered by the OpenTracing project do not need to be listed here, e.g. Erlang.

Feature	Go	Java	JS	Python	Ruby	PHP	Rust	C++	.NET	Swift
Create OpenTracing Shim						+
Tracer						+
Span						+
SpanContext						+
ScopeManager						+
Error mapping for attributes/events						+
Migration to OpenTelemetry guide