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Enable exemplars by default #5778

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merged 1 commit into from
Sep 11, 2024

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@dashpole dashpole commented Sep 4, 2024

Part of #5249.

Addresses #5249 (comment)

This removes handling of the OTEL_GO_X_EXEMPLAR environment variable.

Instead of changing the default for the existing environment variable to enable it by default, i'm just removing it entirely. Users can still disable the feature by setting the filter to always_off. Since we will continue to support that configuration, it seems better to direct users there, rather than give them a temporary equivalent.

@dashpole dashpole force-pushed the on_by_default_exemplar branch from 5ef9d10 to bebd487 Compare September 4, 2024 20:44
@dashpole dashpole added area:metrics Part of OpenTelemetry Metrics pkg:SDK Related to an SDK package enhancement New feature or request labels Sep 4, 2024
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codecov bot commented Sep 4, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.5%. Comparing base (97ee172) to head (fdb098d).
Report is 1 commits behind head on main.

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@@           Coverage Diff           @@
##            main   #5778     +/-   ##
=======================================
- Coverage   84.5%   84.5%   -0.1%     
=======================================
  Files        272     272             
  Lines      22773   22766      -7     
=======================================
- Hits       19258   19250      -8     
- Misses      3172    3173      +1     
  Partials     343     343             

see 3 files with indirect coverage changes

@dashpole dashpole force-pushed the on_by_default_exemplar branch from bebd487 to fc1f3ba Compare September 4, 2024 20:48
@dashpole dashpole marked this pull request as ready for review September 5, 2024 12:52
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@dashpole dashpole force-pushed the on_by_default_exemplar branch from ee1db28 to fdb098d Compare September 11, 2024 18:59
@dashpole dashpole merged commit 6e2f72f into open-telemetry:main Sep 11, 2024
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@dashpole dashpole deleted the on_by_default_exemplar branch September 11, 2024 19:07
@MrAlias MrAlias added this to the v1.31.0 milestone Oct 10, 2024
dashpole added a commit that referenced this pull request Oct 11, 2024
### Added

- Add `go.opentelemetry.io/otel/sdk/metric/exemplar` package which
includes `Exemplar`, `Filter`, `TraceBasedFilter`, `AlwaysOnFilter`,
`HistogramReservoir`, `FixedSizeReservoir`, `Reservoir`, `Value` and
`ValueType` types. These will be used for configuring the exemplar
reservoir for the metrics sdk. (#5747, #5862)
- Add `WithExportBufferSize` option to log batch processor.(#5877)

### Changed

- Enable exemplars by default in `go.opentelemetry.io/otel/sdk/metric`.
Exemplars can be disabled by setting
`OTEL_METRICS_EXEMPLAR_FILTER=always_off` (#5778)
- `Logger.Enabled` in `go.opentelemetry.io/otel/log` now accepts a newly
introduced `EnabledParameters` type instead of `Record`. (#5791)
- `FilterProcessor.Enabled` in
`go.opentelemetry.io/otel/sdk/log/internal/x` now accepts
`EnabledParameters` instead of `Record`. (#5791)
- The `Record` type in `go.opentelemetry.io/otel/log` is no longer
comparable. (#5847)
- Performance improvements for the trace SDK `SetAttributes` method in
`Span`. (#5864)
- Reduce memory allocations for the `Event` and `Link` lists in `Span`.
(#5858)
- Performance improvements for the trace SDK `AddEvent`, `AddLink`,
`RecordError` and `End` methods in `Span`. (#5874)

### Deprecated

- Deprecate all examples under `go.opentelemetry.io/otel/example` as
they are moved to [Contrib
repository](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/examples).
(#5854)

### Fixed

- The race condition for multiple `FixedSize` exemplar reservoirs
identified in #5814 is resolved. (#5819)
- Fix log records duplication in case of heterogeneous resource
attributes by correctly mapping each log record to it's resource and
scope. (#5803)
- Fix timer channel drain to avoid hanging on Go 1.23. (#5868)
- Fix delegation for global meter providers, and panic when calling
otel.SetMeterProvider. (#5827)
- Change the `reflect.TypeOf` to use a nil pointer to not allocate on
the heap unless necessary. (#5827)
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