Overview

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. (#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)

What's Changed

• chore(deps): update otel/opentelemetry-collector-contrib docker tag to v0.109.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5802
• Enable exemplars by default by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/5778
• fix(deps): update module go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp to v0.55.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5809
• fix(deps): update module google.golang.org/grpc to v1.66.2 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5807
• fix(deps): update module go.opentelemetry.io/contrib/bridges/otelslog to v0.5.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5808
• log: Introduce EnabledParameters by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/5791
• Group the google/x renovabot upgrades by @dmathieu in https://github.com/open-telemetry/opentelemetry-go/pull/5813
• Fix gosec overflow alerts by @dmathieu in https://github.com/open-telemetry/opentelemetry-go/pull/5799
• fix(deps): update module github.com/golangci/golangci-lint to v1.61.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5796
• doc(metric): fix incorrect explanation of how metric.WithAttributes works by @wzy9607 in https://github.com/open-telemetry/opentelemetry-go/pull/5822
• simplify conversions from slice to array by @snowcrumble in https://github.com/open-telemetry/opentelemetry-go/pull/5818
• Move global random number generator to randRes field by @MrAlias in https://github.com/open-telemetry/opentelemetry-go/pull/5819
• Fix duplicate logs across resources by @pree-dew in https://github.com/open-telemetry/opentelemetry-go/pull/5803
• fix(deps): update module github.com/prometheus/client_golang to v1.20.4 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5826
• fix(deps): update module google.golang.org/grpc to v1.67.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5831
• [chore]: enable bool-compare rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5829
• [chore]: enable len and empty rules from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5832
• [chore]: enable suite-extra-assert-call rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5833
• chore(deps): update module github.com/klauspost/compress to v1.17.10 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5834
• [chore]: enable error-is-as rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5836
• chore(deps): update googleapis to 9d4c2d2 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5841
• chore(deps): update otel/opentelemetry-collector-contrib docker tag to v0.110.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5842
• chore(deps): update module github.com/rogpeppe/go-internal to v1.13.1 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5835
• [chore]: enable error-nil rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5843
• clarify that users should not directly use the log bridge API by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/5837
• log: Make Record not comparable by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/5847
• [chore]: enable expected-actual rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5848
• Move exemplar types to non-internal package by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/5747
• [chore]: enable negative-positive rule from testifylint by @mmorel-35 in https://github.com/open-telemetry/opentelemetry-go/pull/5849
• chore(deps): update googleapis to af27646 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5855
• fix(deps): update module google.golang.org/grpc to v1.67.1 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5857
• Deprecate examples and redirect to contrib by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/5854
• Move @MadVikingGod to Emeritus status by @MrAlias in https://github.com/open-telemetry/opentelemetry-go/pull/5856
• fix(deps): update module github.com/prometheus/common to v0.60.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5860
• chore(deps): update codecov/codecov-action action to v4.6.0 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5859
• Rename SampledFilter to TraceBasedFilter by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/5862
• Authenticate link checking requests by @dmathieu in https://github.com/open-telemetry/opentelemetry-go/pull/5865
• [doc] sdk/log: Do not create instances of Record by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/5871
• Move @hanyuancheung to Emeritus status by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/5863
• Fix timer channel drain to avoid hanging in Go 1.23 by @dany74q in https://github.com/open-telemetry/opentelemetry-go/pull/5869
• Fix delegation for global MeterProviders by @Jesse-Bonfire in https://github.com/open-telemetry/opentelemetry-go/pull/5828
• fix(deps): update golang.org/x by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5872
• Performance improvements for recordingSpan SetAttributes and addOverCapAttrs by @boekkooi-impossiblecloud in https://github.com/open-telemetry/opentelemetry-go/pull/5864
• fix(deps): update module google.golang.org/protobuf to v1.35.1 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5875
• chore(deps): update googleapis to 5fefd90 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5876
• Reduce newEvictedQueueLink and newEvictedQueueEvent memory allocations by @boekkooi-impossiblecloud in https://github.com/open-telemetry/opentelemetry-go/pull/5858
• chore(deps): update lycheeverse/lychee-action action to v2 by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5878
• Performance improvements for the trace SDK in Span. by @boekkooi-impossiblecloud in https://github.com/open-telemetry/opentelemetry-go/pull/5874
• fix(deps): update golang.org/x/exp digest to f66d83c by @renovate in https://github.com/open-telemetry/opentelemetry-go/pull/5880
• Add an option to configure the exporter buffer of the BatchProcessor by @Frapschen in https://github.com/open-telemetry/opentelemetry-go/pull/5877
• Release v1.31.0/v0.53.0/v0.7.0/v0.0.10 by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/5883

New Contributors

• @wzy9607 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5822
• @snowcrumble made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5818
• @mmorel-35 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5829
• @dany74q made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5869
• @Jesse-Bonfire made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5828
• @boekkooi-impossiblecloud made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/5864

Full Changelog: https://github.com/open-telemetry/opentelemetry-go/compare/v1.30.0...v1.31.0