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Add JS missing supported features in Specification Compliance Matrix #4724

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4b2fc8c
Add JS missing supported features
hectorhdzg Nov 5, 2025
dc21780
Addressing comments
hectorhdzg Nov 6, 2025
0167fc7
Merge branch 'main' into hectorhdzg/jscompliance
hectorhdzg Nov 6, 2025
f6aa3fb
Address comment
hectorhdzg Nov 7, 2025
95b3065
Update broken link for CI/CD Observability SIG Phase 2
hectorhdzg Nov 7, 2025
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2 changes: 1 addition & 1 deletion oteps/0258-env-context-baggage-carriers.md
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Expand Up @@ -50,7 +50,7 @@ Notably, as we define semantic conventions within the [CI/CD Working Group][cicd
we'll need the specification defined for the industry to be able to adopt
native tracing within CI/CD systems.

[cicd-wg]: https://github.com/open-telemetry/community/blob/main/projects/ci-cd.md
[cicd-wg]: https://github.com/open-telemetry/community/blob/main/projects/ci-cd-phase-2.md
[issue-740]: https://github.com/open-telemetry/opentelemetry-specification/issues/740#issue-665588273
[tmp]: https://opentelemetry.io/docs/specs/otel/context/api-propagators/#textmap-propagator

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82 changes: 41 additions & 41 deletions spec-compliance-matrix.md
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Expand Up @@ -19,12 +19,12 @@ formats is required. Implementing more than one format is optional.
| [TracerProvider](specification/trace/api.md#tracerprovider-operations) | 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 schema_url | | + | + | + | + | | | + | | + | | |
| Get a Tracer with scope attributes | | + | | | + | | | + | | + | | |
| Associate Tracer with InstrumentationScope | | + | | | + | + | | + | | | | |
| Associate Tracer with InstrumentationScope | | + | | + | + | + | | + | | | | |
| Safe for concurrent calls | | + | + | + | + | + | + | + | + | + | + | + |
| Shutdown (SDK only required) | | + | + | + | + | + | + | + | + | + | + | + |
| ForceFlush (SDK only required) | | + | + | - | + | + | + | + | + | + | + | + |
| ForceFlush (SDK only required) | | + | + | + | + | + | + | + | + | + | + | + |
| [Trace / Context interaction](specification/trace/api.md#context-interaction) | Optional | Go | Java | JS | Python | Ruby | Erlang | PHP | Rust | C++ | .NET | Swift |
| Get active Span | | N/A | + | + | + | + | + | + | + | + | + | + |
| Set active Span | | N/A | + | + | + | + | + | + | + | + | + | + |
Expand Down Expand Up @@ -67,9 +67,9 @@ formats is required. Implementing more than one format is optional.
| `null` values documented as invalid/undefined | | + | + | + | + | + | N/A | + | | + | | N/A |
| Unicode support for keys and string values | | + | + | + | + | + | + | + | + | + | + | + |
| [Span linking](specification/trace/api.md#specifying-links) | 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 | | + | + | | + | + | + | + | + | + | + | |
| Links can be recorded on span creation | | + | + | + | + | + | + | + | + | + | + | |
| Links can be recorded after span creation | | + | | + | + | | | + | | + | + | |
| Links order is preserved | | + | + | + | + | + | + | + | + | + | + | |
| [Span events](specification/trace/api.md#add-events) | Optional | Go | Java | JS | Python | Ruby | Erlang | PHP | Rust | C++ | .NET | Swift |
| AddEvent | | + | + | + | + | + | + | + | + | + | + | + |
| Add order preserved | | + | + | + | + | + | + | + | + | + | + | + |
Expand All @@ -80,13 +80,13 @@ formats is required. Implementing more than one format is optional.
| [Sampling](specification/trace/sdk.md#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 | | + | + | | | | | - | + | | | |
| Sampler: JaegerRemoteSampler | | + | + | + | | | | - | + | | | |
| [New Span ID created also for non-recording Spans](specification/trace/sdk.md#sdk-span-creation) | | + | + | | + | + | + | + | + | + | - | + |
| [IdGenerators](specification/trace/sdk.md#id-generators) | | + | + | | + | + | + | + | + | + | | + |
| [SpanLimits](specification/trace/sdk.md#span-limits) | X | + | + | | + | + | + | + | | - | | + |
| [Built-in `SpanProcessor`s implement `ForceFlush` spec](specification/trace/sdk.md#forceflush-1) | | + | + | | + | + | + | + | + | + | + | |
| [Attribute Limits](specification/common/README.md#attribute-limits) | X | + | + | | + | + | + | + | | | | |
| Fetch InstrumentationScope from ReadableSpan | | + | + | | + | | | + | | | | |
| [IdGenerators](specification/trace/sdk.md#id-generators) | | + | + | + | + | + | + | + | + | + | | + |
| [SpanLimits](specification/trace/sdk.md#span-limits) | X | + | + | + | + | + | + | + | | - | | + |
| [Built-in `SpanProcessor`s implement `ForceFlush` spec](specification/trace/sdk.md#forceflush-1) | | + | + | + | + | + | + | + | + | + | + | |
| [Attribute Limits](specification/common/README.md#attribute-limits) | X | + | + | + | + | + | + | + | | | | |
| Fetch InstrumentationScope from ReadableSpan | | + | + | + | + | | | + | | | | |
| [Support W3C Trace Context Level 2 randomness](specification/trace/sdk.md#traceid-randomness) | X | - | | | | | | | | | | |
| [TraceIdRatioBased sampler implements OpenTelemetry tracestate `th` field](specification/trace/sdk.md#traceidratiobased) | X | - | | | | | | | | | | |
| [CompositeSampler and built-in ComposableSamplers](specification/trace/sdk.md#compositesampler) | X | - | | | | | | | | | | |
Expand All @@ -106,15 +106,15 @@ formats is required. Implementing more than one format is optional.
| 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`. | | + | | | + | | | + | + | + | | |
| `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. | | + | - | - | + | + | - | + | + | - | - | |
| `Gauge` instrument is supported. | | + | - | + | + | + | - | + | + | - | - | |
| `UpDownCounter` instrument is supported. | | + | + | + | + | + | + | + | + | + | + | |
| `AsynchronousUpDownCounter` instrument is supported. | | + | + | + | + | + | + | + | + | + | + | |
| Instruments have `name` | | + | + | + | + | + | + | + | + | + | + | |
Expand Down Expand Up @@ -145,18 +145,18 @@ formats is required. Implementing more than one format is optional.
| 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 `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 `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 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. | | + | + | + | - | + | + | | | + | + | |
Expand All @@ -167,19 +167,19 @@ formats is required. Implementing more than one format is optional.
| 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. | | + | + | | - | | + | | | | - | |
| 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 | | - | | | | | - | | | | | |
Expand All @@ -194,21 +194,21 @@ Disclaimer: this list of features is still a work in progress, please refer to t

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

## Resource
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