Add ci_pipeline_otlp_trace_correlation feature flag

Renée Hendricksenrequested to merge
ci-pipeline-otlp-trace-correlation-ff into master

What does this MR do and why?

Adds the ci_pipeline_otlp_trace_correlation feature flag (gitlab_com_derisk, default disabled).

This flag will be used by !240239 (merged) to gate the deterministic TraceContext-based trace/span ID correlation for CI pipeline observability OTLP export (traces, logs, and metrics). Adding the flag definition separately so the implementation MR can reference it.

This MR only introduces the feature flag definition; no behavior changes.

Feature flag

Flag Type Default
ci_pipeline_otlp_trace_correlation gitlab_com_derisk disabled

The rollout issue will be created as part of the rollout process.

MR acceptance checklist

  • Feature flag definition only; no functional changes.

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