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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, Zipkin, and Jaeger), 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
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
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
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
Links can be recorded on span creation + + + + + + + + +
Links order is preserved + + + + + + + + +
Span events
AddEvent + + + + + + + + + + +
Add order preserved + + + + + + + + + + +
Safe for concurrent calls + + + + + + + + + + +
Span exceptions
RecordException - + + + + + + + - + -
RecordException with extra parameters - + + + + + + + - + -
Sampling
Allow samplers to modify tracestate + + + + + + + + - +
ShouldSample gets full parent Context + + + + + + + + + - +
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. + + + +
The meter provides functions to create a new Counter. + + + + + + +
The meter provides functions to create a new AsynchronousCounter. + + + + + + +
The meter provides functions to create a new Histogram. + + + + + + +
The meter provides functions to create a new AsynchronousGauge. + + + + + + +
The meter provides functions to create a new UpDownCounter. + + + + + + +
The meter provides functions to create a new AsynchronousUpDownCounter. + + + + + + +
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. + + +
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. - + - - +
create_counter returns a Counter. + + + + + + +
The API for Counter accepts the name, unit and description of the instrument. + + + + + + +
Counter has an add method. + + + + + + +
The add method returns no (or dummy) value. X + + + + + + +
The add method accepts optional attributes. + + + + + + +
The add method accepts the increment amount. + + + + + + +
The add method of Counter accepts only positive amounts. + + + + + -
create_asynchronous_counter creates an AsynchronousCounter. + + + + + + +
The API for AsynchronousCounter accepts the name, unit and description of the instrument. + + + + + + +
The API for AsynchronousCounter accepts a callback. + + + + + + +
create_up_down_counter returns an UpDownCounter. + + + + + + +
The API for UpDownCounter accepts the name, unit and description of the instrument. + + + + + + +
UpDownCounter has an add method. + + + + + + +
The add method returns no (or dummy) value. X + + + + + + +
The add method accepts optional attributes. + + + + + + +
The add method accepts the increment amount. + + + + + + +
create_asynchronous_up_down_counter creates an AsynchronousUpDownCounter. + + + + + + +
The API for AsynchronousUpDownCounter accepts the name, unit and description of the instrument. + + + + + + +
The API for AsynchronousUpDownCounter accepts a callback. + + + + + + +
create_histogram returns a Histogram. + + + + + + +
The API for Histogram accepts the name, unit and description of the instrument. + + + + + + +
Histogram has a record method. + + + + + + +
The record method return no (or dummy) value. X + + + + + + +
The record method accepts optional attributes. + + + + + + +
The record method accepts a value. + + + + + + +
The record method of Histogram accepts only positive amounts. - + + + + +
create_asynchronous_gauge creates an Asynchronous Gauge. + + + + + + +
The API for AsynchronousGauge accepts the name, unit and description of the instrument. + + + + + + +
The API for AsynchronousGauge accepts a callback. + + + + + + +
The callback function of an Asynchronous instrument does not block indefinitely. X - - + - + ?
The callback function reports Measurements. + + + + + +
There is a way to pass state to the callback. X + + + + +
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 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 samples measurements in the context of a sampled trace by default. + - -
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. X - - + -
An ExemplarReservoir has an offer method with access to the measurement value, attributes, Context and timestamp. X - - + -
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. + - -
The metrics SDK provides an ExemplarFilter interface or extension point. X - - + -
An ExemplarFilter has access to the measurement value, attributes, Context and timestamp. X - - + -

Logs

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
Logging SDK 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 +
Implicit Context Injection - + +
Explicit 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 + + + + + + + + - -
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_JAEGER_* + + + + - - - + -
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_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 +

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 +
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 + + + - + + + + +
Jaeger Optional Go Java JS Python Ruby Erlang PHP Rust C++ .NET Swift
Jaeger Thrift over UDP X + + + - - + + + +
Jaeger Protobuf via gRPC X - + + - - - - - -
Jaeger Thrift over HTTP X + - + + - - + + + -
Service name mapping + + + + - - + + +
Resource to Process mapping + + + + - - + - + -
InstrumentationLibrary mapping + + + + - - + - + -
InstrumentationScope mapping + +
Status mapping + + + + - - + + + +
Error Status mapping + + + + - - + + + -
Events converted to Logs + + + + - - + - + +
OpenCensus
TBD
Prometheus
TBD

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