Added

• Add Recorder in go.opentelemetry.io/otel/log/logtest to facilitate testing the log bridge implementations. (#5134)
• Add span flags to OTLP spans and links exported by go.opentelemetry.io/otel/exporters/otlp/otlptrace. (#5194)
• Make the initial alpha release of go.opentelemetry.io/otel/sdk/log. This new module contains the Go implementation of the OpenTelemetry Logs SDK. This module is unstable and breaking changes may be introduced. See our versioning policy for more information about these stability guarantees. (#5240)
• Make the initial alpha release of go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. This new module contains an OTLP exporter that transmits log telemetry using HTTP. This module is unstable and breaking changes may be introduced. See our versioning policy for more information about these stability guarantees. (#5240)
• Make the initial alpha release of go.opentelemetry.io/otel/exporters/stdout/stdoutlog. This new module contains an exporter prints log records to STDOUT. This module is unstable and breaking changes may be introduced. See our versioning policy for more information about these stability guarantees. (#5240)
• The go.opentelemetry.io/otel/semconv/v1.25.0 package. The package contains semantic conventions from the v1.25.0 version of the OpenTelemetry Semantic Conventions. (#5254)

Changed

• Update go.opentelemetry.io/proto/otlp from v1.1.0 to v1.2.0. (#5177)
• Improve performance of baggage member character validation in go.opentelemetry.io/otel/baggage. (#5214)

Full Changelog: https://github.com/open-telemetry/opentelemetry-go/compare/v1.25.0...v1.26.0