Release 1.52.0

Context

• Make the W3C randomness flag required.
  (#4761)

Traces

• Deprecate Zipkin exporter document and make exporter implementation optional.
  (#4715)
• Add spec for AlwaysRecord sampler
  (#4699)

Metrics

• Stabilize Enabled API for synchronous instruments.
  (#4746)
• Allow instrument Enabled implementation to have additional optimizations and features.
  (#4747)

Logs

• Stabilize LogRecordProcessor.Enabled.
  (#4717)

SDK Configuration

• Clarifies that guidance related to boolean environment variables is not applicable
  to other configuration interfaces. (#4723)

New Contributors

• @majanjua-amzn made their first contribution in #4699
• @vitorvasc made their first contribution in #4778
• @BatmanAoD made their first contribution in #4795