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

[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)

[1.40.0/0.62.0/0.16.0] 2026-02-02

Added

• Add AlwaysRecord sampler in go.opentelemetry.io/otel/sdk/trace. (#7724)
• Add Enabled method to all synchronous instrument interfaces (Float64Counter, Float64UpDownCounter, Float64Histogram, Float64Gauge, Int64Counter, Int64UpDownCounter, Int64Histogram, Int64Gauge,) in go.opentelemetry.io/otel/metric. This stabilizes the synchronous instrument enabled feature, allowing users to check if an instrument will process measurements before performing computationally expensive operations. (#7763)
• Add go.opentelemetry.io/otel/semconv/v1.39.0 package. The package contains semantic conventions from the v1.39.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.38.0. (#7783, #7789)

Changed

• Improve the concurrent performance of HistogramReservoir in go.opentelemetry.io/otel/sdk/metric/exemplar by 4x. (#7443)
• Improve the concurrent performance of FixedSizeReservoir in go.opentelemetry.io/otel/sdk/metric/exemplar. (#7447)
• Improve performance of concurrent histogram measurements in go.opentelemetry.io/otel/sdk/metric. (#7474)
• Improve performance of concurrent synchronous gauge measurements in go.opentelemetry.io/otel/sdk/metric. (#7478)
• Add experimental observability metrics in go.opentelemetry.io/otel/exporters/stdout/stdoutmetric. (#7492)
• Exporter in go.opentelemetry.io/otel/exporters/prometheus ignores metrics with the scope go.opentelemetry.io/contrib/bridges/prometheus. This prevents scrape failures when the Prometheus exporter is misconfigured to get data from the Prometheus bridge. (#7688)
• Improve performance of concurrent exponential histogram measurements in go.opentelemetry.io/otel/sdk/metric. (#7702)
• The rpc.grpc.status_code attribute in the experimental metrics emitted from go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc is replaced with the rpc.response.status_code attribute to align with the semantic conventions. (#7854)
• The rpc.grpc.status_code attribute in the experimental metrics emitted from go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc is replaced with the rpc.response.status_code attribute to align with the semantic conventions. (#7854)

Fixed

• Fix bad log message when key-value pairs are dropped because of key duplication in go.opentelemetry.io/otel/sdk/log. (#7662)
• Fix DroppedAttributes on Record in go.opentelemetry.io/otel/sdk/log to not count the non-attribute key-value pairs dropped because of key duplication. (#7662)
• Fix SetAttributes on Record in go.opentelemetry.io/otel/sdk/log to not log that attributes are dropped when they are actually not dropped. (#7662)
• Fix missing request.GetBody in go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp to correctly handle HTTP/2 GOAWAY frame. (#7794)
• WithHostID detector in go.opentelemetry.io/otel/sdk/resource to use full path for ioreg command on Darwin (macOS). (#7818)

... (truncated)

• 4575a97 Release 1.41.0/0.63.0/0.17.0/0.0.15 (#7977)
• 66fc10d fix: add error handling for insecure HTTP endpoints with TLS client configura...
• 76e6eec chore(deps): update github/codeql-action action to v4.32.5 (#7980)
• 0d50f90 Revert "Generate semconv/v1.40.0" (#7978)
• c38a4a5 Generate semconv/v1.40.0 (#7929)
• 0f1a224 chore(deps): update module github.com/securego/gosec/v2 to v2.23.0 (#7899)
• c79ebf4 chore(deps): update module github.com/daixiang0/gci to v0.14.0 (#7973)
• f758157 chore(deps): update module github.com/sonatard/noctx to v0.5.0 (#7968)
• 92a1164 fix(deps): update github.com/opentracing-contrib/go-grpc/test digest to d566b...
• 3cd7c27 chore(deps): update module github.com/protonmail/go-crypto to v1.4.0 (#7969)
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