API

• Clarify that AttributesBuilder.put allows nulls (#7271)
• Stabilize log record event name (#7277)

Context

• Fix duplicated ExecutorService wrap (#7245)
• Promote getAll to TextMapGetter stable API (#7267)

Incubator

• Add ExtendedLogRecordBuilder#setException (#7182)
• Add experimental support for log extended attributes (#7123)

SDK

• Remove Java9VersionSpecific clock implementation (#7221)
• Add addProcessorFirst to SdkTracerProviderBuilder, SdkLoggerProviderBuilder (#7243)

Logs

• Add setLoggerConfigurator support to LoggerProvider (#7332)

Metrics

• Add DelegatingMetricData (#7229)
• Spatial aggregation for async instruments with filtering views (#7264)

Exporters

• Prometheus: Add Authenticator support for PrometheusHttpServer (#7225)
• OTLP: Fix OTLP metric exporter toBuilder() loosing temporality (#7280)
• OTLP: Allow Otlp*MetricExporter's to publish export stats (#7255)

Extensions

• Declarative config: Add support for escaping env var substitution (#7033)
• Declarative config: update to opentelemetry-configuration 0.4 (#7064)
• Declarativeconfig: Refactor internals to add DeclarativeConfigContext (#7293)

Project tooling

• Kotlin extension: Update min kotlin version to 1.8 (#7155)
• Add javadoc site crawler (#7300, #7316)

🙇 Thank you

This release was possible thanks to the following contributors who shared their brilliant ideas and awesome pull requests:

@anuraaga @asafm @breedx-splk @Emily-Jiang @fandreuz @gavarava @iNikem @jack-berg @jaydeluca @jkwatson @JonasKunz @laurit @LikeTheSalad @onurkybsi @opentelemetrybot @ShadabGentle @SoftlySplinter @trask @tsloughter @tylerbenson @vasantteja @zeitlinger