API

• Add convenience method setAttribute(Attribute<Long>, int) to SpanBuilder (matching the existing convenience method in Span) (#6884)
• Extends TextMapGetter with experimental GetAll() method, implement usage in W3CBaggagePropagator (#6852)

SDK

Traces

• Add synchronization to SimpleSpanProcessor to ensure thread-safe export of spans (#6885)

Metrics

• Lazily initialize ReservoirCells (#6851)

Logs

• Add synchronization to SimpleLogRecordProcessor to ensure thread-safe export of logs (#6885)

Exporters

• OTLP: Update opentelementry-proto to 1.4 (#6906)
• OTLP: Rename internal Marshaler#writeJsonToGenerator method to allow jackson runtimeOnly dependency (#6896)
• OTLP: Fix repeated string serialization for JSON. (#6888)
• OTLP: Fix missing unsafe available check (#6920)

Extensions

• Declarative config: Don't require empty objects when referencing custom components (#6891)

Tooling

• Add javadoc boilerplate internal comment v2 for experimental classes (#6886)
• Update develocity configuration (#6903)

🙇 Thank you

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

@asafm @breedx-splk @edma2 @io7m @jack-berg @jamesmoessis @jaydeluca @jhalliday @jkwatson @jsuereth @laurit @ravi-nagendran @slodha @Stoyas @trask