Traces

• Define sampling threshold field in OpenTelemetry TraceState; define the behavior
  of TraceIdRatioBased sampler in terms of W3C Trace Context Level 2 randomness.
  (#4166)
• Define CompositeSampler implementation and built-in ComposableSampler interfaces.
  (#4466)
• Define how SDK implements Tracer.Enabled.
  (#4537)

Logs

• Stabilize Event Name parameter of Logger.Enabled.
  (#4534)
• Stabilize SDK and No-Op Logger.Enabled.
  (#4536)
• SeverityNumber=0 MAY be used to represent an unspecified value.
  (#4535)

Compatibility

• Clarify expectations about Prometheus content negotiation for metric names.
  (#4543)

Supplementary Guidelines

• Add Supplementary Guidelines for environment variables as context carrier
  specification.
  (#4548)

OTEPs

• Extend attributes to support complex values.
  (#4485)

Common

• Update spec to comply with OTEP-232.
  (#4529)

New Contributors

• @ArthurSens made their first contribution in #4543