Sourced from go.opentelemetry.io/otel/trace's changelog.

[1.42.0/0.64.0/0.18.0/0.0.16] 2026-03-06

Added

• Add go.opentelemetry.io/otel/semconv/v1.40.0 package. The package contains semantic conventions from the v1.40.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.39.0. (#7985)
• Add Err and SetErr on Record in go.opentelemetry.io/otel/log to attach an error and set record exception attributes in go.opentelemetry.io/otel/log/sdk. (#7924)

Changed

• TracerProvider.ForceFlush in go.opentelemetry.io/otel/sdk/trace joins errors together and continues iteration through SpanProcessors as opposed to returning the first encountered error without attempting exports on subsequent SpanProcessors. (#7856)

Fixed

• Fix missing request.GetBody in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp to correctly handle HTTP2 GOAWAY frame. (#7931)
• Fix semconv v1.39.0 generated metric helpers skipping required attributes when extra attributes were empty. (#7964)
• Preserve W3C TraceFlags bitmask (including the random Trace ID flag) during trace context extraction and injection in go.opentelemetry.io/otel/propagation. (#7834)

Removed

• Drop support for [Go 1.24]. (#7984)

[1.41.0/0.63.0/0.17.0/0.0.15] 2026-03-02

This release is the last to support [Go 1.24]. The next release will require at least [Go 1.25].

Added

• Support testing of [Go 1.26]. (#7902)

Fixed

• Update Baggage in go.opentelemetry.io/otel/propagation and Parse and New in go.opentelemetry.io/otel/baggage to comply with W3C Baggage specification limits. New and Parse now return partial baggage along with an error when limits are exceeded. Errors from baggage extraction are reported to the global error handler. (#7880)
• Return an error when the endpoint is configured as insecure and with TLS configuration in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#7914)
• Return an error when the endpoint is configured as insecure and with TLS configuration in go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. (#7914)
• Return an error when the endpoint is configured as insecure and with TLS configuration in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#7914)

• a3941ff Release v1.42.0/v0.64.0/v0.18.0/v0.0.16 (#8006)
• 6059c47 chore(deps): update golang.org/x/telemetry digest to e526e8a (#8010)
• 44c7edf chore(deps): update module github.com/mgechev/revive to v1.15.0 (#8009)
• de5fb3a fix(deps): update module google.golang.org/grpc to v1.79.2 (#8007)
• 0b82ded chore(deps): update codspeedhq/action action to v4.11.1 (#8001)
• aa3660f chore(deps): update github/codeql-action action to v4.32.6 (#8004)
• 9be8c92 chore(deps): update dependency codespell to v2.4.2 (#8003)
• c9d2015 log: add error field to Record and make SDK to emit exception attributes (#7924)
• fdd1320 TracerProvider ForceFlush() Error Fix (#7856)
• 78f9904 chore(deps): update golang.org/x/telemetry digest to 18da590 (#8000)
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