This release is the last to support Go 1.25. The next release will require at least Go 1.26.

Added

• Support testing of Go 1.27. (#8811)
• Support http/json protocol in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#8273, #8775, #8831)
• Add Hasher struct and methods in go.opentelemetry.io/otel/attribute to compute authoritative Distinct hashes incrementally for attribute filtering and deduplication. (#8598)

Changed

• Lazily evaluate filtered and dropped attributes on measurement hot paths in go.opentelemetry.io/otel/sdk/metric to avoid unnecessary attribute set allocations. (#8598)
• Add ErrExporterShutdown to go.opentelemetry.io/otel/sdk/log and return it from the go.opentelemetry.io/otel/exporters/stdout/stdoutlog, go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc, and go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp exporters when Export is called after Shutdown. (#8773)
• Clarify in go.opentelemetry.io/otel/log that calling Logger.Enabled is optional and that cached results can become stale. (#8764)

Fixed

• Export dropped attribute counts in OTLP log records from go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc and go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#8829)
• Name span events created from OpenTracing logs after the event log field, falling back to log, instead of always using an empty name in go.opentelemetry.io/otel/bridge/opentracing. (#8648)
• Count exception attributes omitted due to the attribute count limit as dropped in go.opentelemetry.io/otel/sdk/log. (#8796)
• Prevent log record and instrumentation scope attributes with empty keys from reaching processors and exporters in go.opentelemetry.io/otel/sdk/log. (#8797)
• Fix a data race when span attributes are read concurrently in go.opentelemetry.io/otel/sdk/trace. (#8706)
• Prevent a panic in (*Set).Filter when called on a nil receiver in go.opentelemetry.io/otel/attribute. (#8792)
• The simple span and log processors record otel.sdk.processor.{span,log}.processed when the record is submitted to the exporter instead of after the export completes, and no longer set error.type from the export outcome, in go.opentelemetry.io/otel/sdk/trace and go.opentelemetry.io/otel/sdk/log. (#8705)
• Prevent Resource.MarshalLog from panicking on nil resources in go.opentelemetry.io/otel/sdk/resource. (#8758)

What's Changed

• chore(deps): update github/codeql-action action to v4.37.6 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8697
• chore(deps): update module go.opentelemetry.io/collector/featuregate to v1.64.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8698
• chore(deps): update golang.org/x/telemetry digest to bdd03c3 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8699
• fix(deps): update module go.opentelemetry.io/collector/pdata to v1.64.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8700
• chore(deps): update module github.com/grpc-ecosystem/grpc-gateway/v2 to v2.30.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8701
• chore(deps): update module github.com/rogpeppe/go-internal to v1.16.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8702
• chore(deps): update module github.com/cloudflare/circl to v1.6.5 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8703
• Record processor.{span,log}.processed before invoking the exporter in simple processors by @cijothomas in https://github.com/open-telemetry/opentelemetry-go/pull/8705
• perf(sdk/metric): reduce benchmark suite execution time (#8683) by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/8688
• chore(deps): update codspeedhq/action action to v5.0.3 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8710
• attempt 2: Lazily compute filtered and dropped attributes by @dashpole in https://github.com/open-telemetry/opentelemetry-go/pull/8598
• fix(deps): update googleapis to c8921c7 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8712
• chore(deps): update module github.com/santhosh-tekuri/jsonschema/v6 to v6.0.3 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8708
• chore(deps): update github.com/charmbracelet/ultraviolet digest to 402eeaa by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8716
• chore(deps): update module github.com/dlclark/regexp2/v2 to v2.6.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8715
• chore(deps): update mvdan.cc/unparam digest to a64391f by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8717
• fix(deps): update golang.org/x to a8b543c by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8720
• fix(deps): update googleapis to ec0a776 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8719
• chore(deps): update module golang.org/x/mod to v0.39.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8722
• Disable Go module major updates to v2+ by @MrAlias in https://github.com/open-telemetry/opentelemetry-go/pull/8475
• otlp: wrap the Cause error when context is canceled by @bboreham in https://github.com/open-telemetry/opentelemetry-go/pull/7811
• ci: add shared security scanning workflow by @opentelemetrybot in https://github.com/open-telemetry/opentelemetry-go/pull/8684
• fix(deps): update module google.golang.org/protobuf to v1.36.12 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8721
• chore(deps): update open-telemetry/shared-workflows action to v0.6.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8725
• chore(deps): update module github.com/charmbracelet/x/ansi to v0.11.8 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8733
• fix(deps): update golang.org/x by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8732
• chore(deps): update github.com/charmbracelet/ultraviolet digest to 006e29f by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8734
• ci: use shared OSSF Scorecard workflow by @opentelemetrybot in https://github.com/open-telemetry/opentelemetry-go/pull/8737
• Support http/json in otlptracehttp by @sqyang94 in https://github.com/open-telemetry/opentelemetry-go/pull/8273
• chore(deps): update module github.com/xo/terminfo to v1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8727
• fix(deps): update golang.org/x by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8742
• fix(deps): update github.com/opentracing-contrib/go-grpc/test digest to 0e895d2 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8726
• chore(deps): update github.com/charmbracelet/ultraviolet digest to 68fa937 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8741
• chore(deps): update module charm.land/lipgloss/v2 to v2.0.6 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8735
• [chore] docs: clarify compatibility promise by @RedZapdos123 in https://github.com/open-telemetry/opentelemetry-go/pull/8686
• chore(deps): update mvdan.cc/unparam digest to 06ca53c by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8744
• [chore] Reenable context-as-argument revive linter by @om7057 in https://github.com/open-telemetry/opentelemetry-go/pull/8718
• fix(deps): update golang.org/x by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8746
• chore(deps): update github/codeql-action action to v4.37.7 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8745
• chore(deps): update module github.com/sirupsen/logrus to v1.10.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8747
• fix(deps): update golang.org/x by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8748
• ci: add cross-build workflow by @TheJhyeFactor in https://github.com/open-telemetry/opentelemetry-go/pull/8634
• Add partial benchmarks in CI by @XSAM in https://github.com/open-telemetry/opentelemetry-go/pull/8387
• chore(deps): update ubuntu docker tag to v26 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8755
• chore(deps): update mvdan.cc/unparam digest to 3570034 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8749
• chore(deps): update open-telemetry/shared-workflows action to v0.7.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8751
• chore(deps): update golang.org/x/telemetry digest to d8c1694 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8757
• chore(deps): update module github.com/dlclark/regexp2/v2 to v2.7.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8761
• chore(deps): update module go.opentelemetry.io/collector/featuregate to v1.65.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8767
• Fix race in concurrent span attribute reads by @MrAlias in https://github.com/open-telemetry/opentelemetry-go/pull/8706
• Test OTLP retry cancellation causes by @MrAlias in https://github.com/open-telemetry/opentelemetry-go/pull/8724
• chore(deps): update module github.com/mattn/go-runewidth to v0.0.28 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8771
• log: clarify that Logger.Enabled is optional by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8764
• Prevent a nil-pointer panic in (*attribute.Set).Filter by @Shaurya2k06 in https://github.com/open-telemetry/opentelemetry-go/pull/8792
• Return shutdown error from log exporters by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8773
• fix(deps): update module google.golang.org/grpc to v1.83.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8804
• chore(deps): update module github.com/sirupsen/logrus to v1.10.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8803
• fix(deps): update github.com/opentracing-contrib/go-grpc/test digest to 8a76746 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8799
• chore(deps): update ubuntu:26.04 docker digest to 889d056 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8798
• chore(deps): update module github.com/alwxsin/noinlineerr to v1.0.6 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8794
• chore(deps): update mvdan.cc/unparam digest to 3f964bc by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8793
• fix(deps): update googleapis to 08b0e42 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8770
• fix(deps): update module go.opentelemetry.io/collector/pdata to v1.65.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8768
• fix(deps): update module github.com/stretchr/testify to v1.12.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8763
• chore(deps): update open-telemetry/shared-workflows action to v0.8.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8807
• chore(deps): update golang.org/x/telemetry digest to f79da96 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8806
• fix(deps): update module github.com/golangci/golangci-lint/v2 to v2.13.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8808
• Fix grammar in Logs GoDoc comments by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8802
• chore(deps): update module github.com/bombsimon/wsl/v5 to v5.9.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8810
• chore(deps): update mvdan.cc/unparam digest to a201bf8 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8809
• chore(deps): update module github.com/nunnatsa/ginkgolinter to v0.24.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8813
• sdk/resource: prevent nil MarshalLog panic by @jstar0 in https://github.com/open-telemetry/opentelemetry-go/pull/8758
• sdk/log: discard attributes with empty keys by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8797
• fix(deps): update golang.org/x by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8814
• fix(deps): update module github.com/golangci/golangci-lint/v2 to v2.13.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8818
• Support Go 1.27 by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8811
• Fix OTLP JSON encoding of non-finite doubles by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8775
• chore(deps): update open-telemetry/shared-workflows action to v0.10.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8821
• chore(deps): update github/codeql-action action to v4.37.8 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8833
• sdk/log: count limit-suppressed exception attributes as dropped by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8796
• bridge/opentracing: set span event name from the event log field by @singhlovepreet9 in https://github.com/open-telemetry/opentelemetry-go/pull/8648
• [chore] Remove stale TODO(#7066) comments in prometheus exporter by @om7057 in https://github.com/open-telemetry/opentelemetry-go/pull/8738
• chore(deps): update module github.com/mgechev/revive to v1.16.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8835
• [chore] Add doc comments to exported internal symbols (2/N) by @om7057 in https://github.com/open-telemetry/opentelemetry-go/pull/8762
• chore(deps): update mvdan.cc/unparam digest to 2fa3d84 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8850
• chore(deps): update golang.org/x/telemetry digest to 16c97dc by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8837
• chore(deps): update module github.com/uudashr/iface to v1.5.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8841
• chore(deps): update codspeedhq/action action to v5.2.0 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8851
• chore(deps): update module honnef.co/go/tools to v0.8.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8816
• otlplog: export dropped attribute count by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8829
• otlptracehttp: Accept quoted finite doubles in OTLP JSON by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8831
• sdk/log: Add interface stability markers by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8855
• attribute: clarify xxhash test purpose by @RedZapdos123 in https://github.com/open-telemetry/opentelemetry-go/pull/8753
• chore(deps): update codspeedhq/action action to v5.2.1 by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8854
• chore(deps): update golang.org/x/telemetry digest to 1f5465a by @renovate[bot] in https://github.com/open-telemetry/opentelemetry-go/pull/8853
• Release v1.46.0 by @pellared in https://github.com/open-telemetry/opentelemetry-go/pull/8858

New Contributors

• @sqyang94 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8273
• @om7057 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8718
• @TheJhyeFactor made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8634
• @Shaurya2k06 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8792
• @jstar0 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8758
• @singhlovepreet9 made their first contribution in https://github.com/open-telemetry/opentelemetry-go/pull/8648

Full Changelog: https://github.com/open-telemetry/opentelemetry-go/compare/v1.45.0...v1.46.0