sdk/metric: Deprecate the sdk/metric/x Feature Supporting Cardinality Limits
#7166
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #7166 +/- ##
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- Coverage 83.0% 82.9% -0.1%
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Files 264 264
Lines 24634 24628 -6
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- Hits 20448 20422 -26
- Misses 3803 3823 +20
Partials 383 383
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Aug 11, 2025
Co-authored-by: Robert Pająk <[email protected]>
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…g-Cardinality-Limits
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This release is the last to support [Go 1.23]. The next release will require at least [Go 1.24]. ### Added - Add native histogram exemplar support in `go.opentelemetry.io/otel/exporters/prometheus`. (#6772) - Add template attribute functions to the `go.opentelmetry.io/otel/semconv/v1.34.0` package. (#6939) - `ContainerLabel` - `DBOperationParameter` - `DBSystemParameter` - `HTTPRequestHeader` - `HTTPResponseHeader` - `K8SCronJobAnnotation` - `K8SCronJobLabel` - `K8SDaemonSetAnnotation` - `K8SDaemonSetLabel` - `K8SDeploymentAnnotation` - `K8SDeploymentLabel` - `K8SJobAnnotation` - `K8SJobLabel` - `K8SNamespaceAnnotation` - `K8SNamespaceLabel` - `K8SNodeAnnotation` - `K8SNodeLabel` - `K8SPodAnnotation` - `K8SPodLabel` - `K8SReplicaSetAnnotation` - `K8SReplicaSetLabel` - `K8SStatefulSetAnnotation` - `K8SStatefulSetLabel` - `ProcessEnvironmentVariable` - `RPCConnectRPCRequestMetadata` - `RPCConnectRPCResponseMetadata` - `RPCGRPCRequestMetadata` - `RPCGRPCResponseMetadata` - Add `ErrorType` attribute helper function to the `go.opentelmetry.io/otel/semconv/v1.34.0` package. (#6962) - Add `WithAllowKeyDuplication` in `go.opentelemetry.io/otel/sdk/log` which can be used to disable deduplication for log records. (#6968) - Add `WithCardinalityLimit` option to configure the cardinality limit in `go.opentelemetry.io/otel/sdk/metric`. (#6996, #7065, #7081, #7164, #7165, #7179) - Add `Clone` method to `Record` in `go.opentelemetry.io/otel/log` that returns a copy of the record with no shared state. (#7001) - Add experimental self-observability span and batch span processor metrics in `go.opentelemetry.io/otel/sdk/trace`. Check the `go.opentelemetry.io/otel/sdk/trace/internal/x` package documentation for more information. (#7027, #6393, #7209) - The `go.opentelemetry.io/otel/semconv/v1.36.0` package. The package contains semantic conventions from the `v1.36.0` version of the OpenTelemetry Semantic Conventions. See the [migration documentation](./semconv/v1.36.0/MIGRATION.md) for information on how to upgrade from `go.opentelemetry.io/otel/semconv/v1.34.0.`(#7032, #7041) - Add support for configuring Prometheus name translation using `WithTranslationStrategy` option in `go.opentelemetry.io/otel/exporters/prometheus`. The current default translation strategy when UTF-8 mode is enabled is `NoUTF8EscapingWithSuffixes`, but a future release will change the default strategy to `UnderscoreEscapingWithSuffixes` for compliance with the specification. (#7111) - Add experimental self-observability log metrics in `go.opentelemetry.io/otel/sdk/log`. Check the `go.opentelemetry.io/otel/sdk/log/internal/x` package documentation for more information. (#7121) - Add experimental self-observability trace exporter metrics in `go.opentelemetry.io/otel/exporters/stdout/stdouttrace`. Check the `go.opentelemetry.io/otel/exporters/stdout/stdouttrace/internal/x` package documentation for more information. (#7133) - Support testing of [Go 1.25]. (#7187) - The `go.opentelemetry.io/otel/semconv/v1.37.0` package. The package contains semantic conventions from the `v1.37.0` version of the OpenTelemetry Semantic Conventions. See the [migration documentation](./semconv/v1.37.0/MIGRATION.md) for information on how to upgrade from `go.opentelemetry.io/otel/semconv/v1.36.0.`(#7254) ### Changed - Optimize `TraceIDFromHex` and `SpanIDFromHex` in `go.opentelemetry.io/otel/sdk/trace`. (#6791) - Change `AssertEqual` in `go.opentelemetry.io/otel/log/logtest` to accept `TestingT` in order to support benchmarks and fuzz tests. (#6908) - Change `DefaultExemplarReservoirProviderSelector` in `go.opentelemetry.io/otel/sdk/metric` to use `runtime.GOMAXPROCS(0)` instead of `runtime.NumCPU()` for the `FixedSizeReservoirProvider` default size. (#7094) ### Fixed - `SetBody` method of `Record` in `go.opentelemetry.io/otel/sdk/log` now deduplicates key-value collections (`log.Value` of `log.KindMap` from `go.opentelemetry.io/otel/log`). (#7002) - Fix `go.opentelemetry.io/otel/exporters/prometheus` to not append a suffix if it's already present in metric name. (#7088) - Fix the `go.opentelemetry.io/otel/exporters/stdout/stdouttrace` self-observability component type and name. (#7195) - Fix partial export count metric in `go.opentelemetry.io/otel/exporters/stdout/stdouttrace`. (#7199) ### Deprecated - Deprecate `WithoutUnits` and `WithoutCounterSuffixes` options, preferring `WithTranslationStrategy` instead. (#7111) - Deprecate support for `OTEL_GO_X_CARDINALITY_LIMIT` environment variable in `go.opentelemetry.io/otel/sdk/metric`. Use `WithCardinalityLimit` option instead. (#7166)
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Fixes #6980
Towards #6887
What