[ADMIN] Planned deprecations and removals

[marcalff]

Please check file DEPRECATED.md

Current deprecations:

• Enable WITH_OTLP_RETRY_PREVIEW by default #3953
• Enable WITH_OTLP_GRPC_SSL_MTLS_PREVIEW by default #3970
• [API] Deprecate opentelemetry::plugin #4021
• Zipkin deprecated in the specifications
  • https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk_exporters/zipkin.md
• OpenTracing deprecated in the specifications
  • https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/compatibility/opentracing.md
• TraceIdRatioBased sampler deprecated in the specifications
  • https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#traceidratiobased

Planned removals:

• [REMOVAL] Remove WITH_OTLP_RETRY_PREVIEW - On hold 2026-10-01 #3967
• [REMOVAL] Remove WITH_OTLP_GRPC_SSL_MTLS_PREVIEW - On hold 2026-10-01 #3974
• [REMOVAL] Remove opentelemetry::plugin - On hold 2026-10-01 #4033

[github-actions]

This issue was marked as stale due to lack of activity.