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Add exponential histogram support in go.opentelemetry.io/otel/exporters/prometheus. (#6421)
The go.opentelemetry.io/otel/semconv/v1.31.0 package. The package contains semantic conventions from the v1.31.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.30.0. (#6479)
Add Recording, Scope, and Record types in go.opentelemetry.io/otel/log/logtest. (#6507)
Add WithHTTPClient option to configure the http.Client used by go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp. (#6751)
Add WithHTTPClient option to configure the http.Client used by go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp. (#6752)
Add WithHTTPClient option to configure the http.Client used by go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#6688)
Add ValuesGetter in go.opentelemetry.io/otel/propagation, a TextMapCarrier that supports retrieving multiple values for a single key. (#5973)
Add Values method to HeaderCarrier to implement the new ValuesGetter interface in go.opentelemetry.io/otel/propagation. (#5973)
Update Baggage in go.opentelemetry.io/otel/propagation to retrieve multiple values for a key when the carrier implements ValuesGetter. (#5973)
Add AssertEqual function in go.opentelemetry.io/otel/log/logtest. (#6662)
The go.opentelemetry.io/otel/semconv/v1.32.0 package. The package contains semantic conventions from the v1.32.0 version of the OpenTelemetry Semantic Conventions. See the migration documentation for information on how to upgrade from go.opentelemetry.io/otel/semconv/v1.31.0(#6782)
Add Transform option in go.opentelemetry.io/otel/log/logtest. (#6794)
Add Desc option in go.opentelemetry.io/otel/log/logtest. (#6796)

Drop support for [Go 1.22]. (#6381, #6418)
Remove Resource field from EnabledParameters in go.opentelemetry.io/otel/sdk/log. (#6494)
Remove RecordFactory type from go.opentelemetry.io/otel/log/logtest. (#6492)
Remove ScopeRecords, EmittedRecord, and RecordFactory types from go.opentelemetry.io/otel/log/logtest. (#6507)
Remove AssertRecordEqual function in go.opentelemetry.io/otel/log/logtest, use AssertEqual instead. (#6662)

⚠️ Update github.com/prometheus/client_golang to v1.21.1, which changes the NameValidationScheme to UTF8Validation. This allows metrics names to keep original delimiters (e.g. .), rather than replacing with underscores. This can be reverted by setting github.com/prometheus/common/model.NameValidationScheme to LegacyValidation in github.com/prometheus/common/model. (#6433)
Initialize map with len(keys) in NewAllowKeysFilter and NewDenyKeysFilter to avoid unnecessary allocations in go.opentelemetry.io/otel/attribute. (#6455)
go.opentelemetry.io/otel/log/logtest is now a separate Go module. (#6465)
go.opentelemetry.io/otel/sdk/log/logtest is now a separate Go module. (#6466)
Recorder in go.opentelemetry.io/otel/log/logtest no longer separately stores records emitted by loggers with the same instrumentation scope. (#6507)
Improve performance of BatchProcessor in go.opentelemetry.io/otel/sdk/log by not exporting when exporter cannot accept more. (#6569, #6641)

Deprecate support for model.LegacyValidation for go.opentelemetry.io/otel/exporters/prometheus. (#6449)

Stop percent encoding header environment variables in go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc and go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp. (#6392)
Ensure the noopSpan.tracerProvider method is not inlined in go.opentelemetry.io/otel/trace so the go.opentelemetry.io/auto instrumentation can instrument non-recording spans. (#6456)
Use a sync.Pool instead of allocating metricdata.ResourceMetrics in go.opentelemetry.io/otel/exporters/prometheus. (#6472)

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