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 (e.g. OTLP), 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	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
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	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
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	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
IsValid		+	+	+	+	+	+	+	+	+	+	+
IsRemote		+	+	+	+	+	+	+	+	+	+	+
Conforms to the W3C TraceContext spec		+	+	+	+	+	+	+	+	+	+	+
Support W3C Trace Context Level 2 randomness		-
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		+	+	+	+	+	+	+	+	-	-	+
SpanProcessor.OnEnding	X	-	-	-	-	-	-	-	-	-	-	-
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	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
AddEvent		+	+	+	+	+	+	+	+	+	+	+
Add order preserved		+	+	+	+	+	+	+	+	+	+	+
Safe for concurrent calls		+	+	+	+	+	+	+	+	+	+	+
Span exceptions	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
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 `SpanProcessor`s implement `ForceFlush` spec		+	+	+	+	+	+	+	+	+	+
Attribute Limits	X	+	+	+	+	+	+	+
Fetch InstrumentationScope from ReadableSpan		+	+	+	+			+
TraceIdRatioBased sampler implements OpenTelemetry tracestate `th` field	X	-
CompositeSampler and built-in ComposableSamplers	X	-
Sampler: AlwaysRecord		-

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
The API provides a way to set and get a global default `MeterProvider`.	X	+	+	+	+	+	+	+	+	+	-
It is possible to create any number of `MeterProvider`s.	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.		+	+	+	+	+	+	+	+	+	+
`Gauge` 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 `Meter`s.		+	+	+	+		+		+	+	+
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 `Meter`s.	if above	-	-	-	-		-			-	+
There is a way to register `View`s 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 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 excluded attribute keys of 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 `Default` aggregation is available.		+	+	+	+	+	+		+	+	+
The `Default` aggregation uses the specified aggregation by instrument.		+	+	+	+	+	+		+	+	+
The `Sum` aggregation is available.		+	+	+	+	+	+	+	+	+	+
The `LastValue` aggregation is available.		+	+	+	+	+	+	+	+	+	+
The `ExplicitBucketHistogram` aggregation is available.		+	+	+	+	+	+	+	+	+	+
The `ExponentialBucketHistogram` aggregation is available.		+		+	+	+					+
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 `Exemplar`s 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		-					-
Metric SDK implements cardinality limit		+	+	+	-		-		-	+	+
Metric SDK supports configuring cardinality limit at MeterReader level		-	+	+	-		-		-	-	-
Metric SDK supports configuring cardinality limit per metric (using Views)		-	+	+	-		-		-	-	+
Metric SDK supports per-timeseries cumulative start timestamps

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	PHP	Rust	C++	.NET
LoggerProvider.Get Logger		+	+	+	+	+	+	+	+	-
LoggerProvider.Get Logger accepts attributes		+			+		+	+	+
LoggerProvider.Shutdown		+	+	+	+	+	+	+	+	-
LoggerProvider.ForceFlush		+	+	+	+	+	+	+	+	-
Logger.Emit(LogRecord)		+	+	+	+	+	+	+	+	-
Logger.Emit(LogRecord) with Exception parameter	X
LogRecord.Set EventName		+						+	+
Logger.Enabled	X	+					+	+	+
Ergonomic API	X
SimpleLogRecordProcessor		+	+	+	+	+	+	+	+
BatchLogRecordProcessor		+	+	+	+	+	+	+	+
Can plug custom LogRecordProcessor		+	+	+	+	+	+	+	+
LogRecordProcessor.Enabled	X	+						+
OTLP/gRPC exporter		+	+	+	+		+	+	+	+
OTLP/HTTP exporter		+	+	+	+	+	+	+	+	+
OTLP File exporter		-	-		-			-	+	-
Can plug custom LogRecordExporter		+	+	+	+	+	+	+	+
Trace Context Injection		+	+		+	+	+	+	+	+

Resource

Feature	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	X	+	+	+	+	+	+	+	+	+	-	+
OT Propagator	X	+	+	+	+						-
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_CONFIG_FILE	-						+		-

Declarative configuration

See declarative configuration for details. Disclaimer: Declarative configuration is currently in Development status - work in progress.

Feature	Go	Java	JS	PHP	C++
`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 plugin 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 `CreateComponent` of corresponding `PluginComponentProvider` when encountering plugin components		+		+	+
Register a `PluginComponentProvider`		+		+	+

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	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
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	+						+
Metric Exporter configurable temporality preference		+	+		+			+
Metric Exporter configurable default aggregation		+	+		+
Zipkin	Optional	Go	Java	JS	Python	Ruby	Erlang	PHP	Rust	C++	.NET	Swift
Zipkin V1 JSON	X	-	+		+	-	-	-	-	-	-	-
Zipkin V1 Thrift	X	-	+		-	-	-	-	-	-	-	-
Zipkin V2 JSON	X	+	+		+	+	-	+	+	+	+	+
Zipkin V2 Protobuf	X	-	+		+	-	+	-	-	-	-	-
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_[attribute] labels on all Metrics		+	-	-	-	-	-	-	-	-	-	-
otel_scope 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

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