Add support for native histogram exemplars #6772

shivanthzen · 2025-05-14T10:23:00Z

Added support for exemplars in exponential histograms.

Closes #5777

dmathieu · 2025-05-14T11:43:28Z

This will need tests.

shivanthzen · 2025-05-31T21:22:11Z

Waiting for release from client golang,
Tested locally

tcolgate · 2025-07-01T15:33:44Z

see #6953

exporters/prometheus/exporter_test.go

MrAlias

@shivanthzen can you add a changelog entry for this?

codecov · 2025-08-01T19:59:22Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.9%. Comparing base (d464abf) to head (6feff90).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #6772   +/-   ##
=====================================
  Coverage   82.9%   82.9%           
=====================================
  Files        262     262           
  Lines      24460   24461    +1     
=====================================
+ Hits       20288   20291    +3     
+ Misses      3796    3794    -2     
  Partials     376     376

Files with missing lines	Coverage Δ
exporters/prometheus/exporter.go	`86.1% <100.0%> (+0.4%)`	⬆️

... and 2 files with indirect coverage changes

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shivanthzen · 2025-08-04T15:51:44Z

@MrAlias Done

CHANGELOG.md

Co-authored-by: Tyler Yahn <[email protected]>

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)

Add native histogram exemplars

fa22973

add tests

ddee583

Merge branch 'main' into nativehistogram_exemplar

02c2d9f

pellared mentioned this pull request Jul 2, 2025

fix(exporter/prometheus): export exemplars on native histograms #6953

Closed

shivanthzen added 4 commits July 31, 2025 15:18

Merge branch 'main' into nativehistogram_exemplar

4c21643

Add labelnamer for native histogram

a2ccbd2

For native histograms, use exemplars from dto exemplar instead of bucket

fb8d1ae

clean up

a800887

shivanthzen marked this pull request as ready for review August 1, 2025 14:58

shivanthzen requested review from MrAlias, XSAM, dashpole, pellared, dmathieu and flc1125 as code owners August 1, 2025 14:58

dashpole approved these changes Aug 1, 2025

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MrAlias reviewed Aug 1, 2025

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shivanthzen added 2 commits August 1, 2025 21:20

Review comments

2ae8ac3

Merge branch 'main' into nativehistogram_exemplar

1bf0811

MrAlias reviewed Aug 1, 2025

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shivanthzen added 2 commits August 4, 2025 17:51

changelog entry

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Merge branch 'main' into nativehistogram_exemplar

ec9aebb

MrAlias reviewed Aug 4, 2025

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shivanthzen added 2 commits August 5, 2025 10:14

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Merge branch 'main' into nativehistogram_exemplar

4b5e8be

pellared approved these changes Aug 5, 2025

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pellared requested a review from MrAlias August 5, 2025 09:18

shivanthzen added 2 commits August 5, 2025 14:17

remove formatting for released section

9a9d73c

change log agian

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MrAlias approved these changes Aug 5, 2025

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MrAlias reviewed Aug 5, 2025

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Update CHANGELOG.md

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Co-authored-by: Tyler Yahn <[email protected]>

pellared merged commit 52d2f66 into open-telemetry:main Aug 5, 2025
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MrAlias added this to the v1.38.0 milestone Aug 20, 2025

MrAlias mentioned this pull request Aug 29, 2025

Release v1.38.0 #7271

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