Update Container Registry immutable tags maturity from Beta to GA
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=588640) </details> <!--IssueSummary end--> ## Summary Update the maturity level of the Container Registry immutable tags feature from **Beta** to **Generally Available (GA)** based on successful rollout, internal testing, and early adoption metrics. ## Current State * **Feature Status**: Live on GitLab.com since GitLab 18.2 * **Current Maturity**: Beta * **Documentation**: https://docs.gitlab.com/user/packages/container_registry/immutable_container_tags * **Feature Flag**: `container_registry_immutable_tags` (enabled by default) ## Justification for Maturity Change to GA ### Adoption Metrics * **\~50 projects** currently using immutable tag rules * Feature has been successfully rolled out to GitLab.com * Internal testing completed with positive results ### Stability Indicators * No critical bugs or security issues reported since Beta release * Feature is functioning as designed across different use cases * JWT token integration with Container Registry working reliably * Production-ready stability demonstrated ### Customer Feedback * Multiple customer requests fulfilled (as documented in the original epic) * Feature addresses key security and compliance requirements * No significant usability issues reported * Ready for full production use ## Requirements ### Documentation Updates * \[ \] Update maturity badge from Beta to GA in documentation * \[ \] Remove any Beta-specific disclaimers or warnings ## Acceptance Criteria * \[ \] Documentation reflects GA maturity level * \[ \] Feature is properly categorized as GA in internal systems ## Technical Notes This change is primarily documentation and labeling - no code changes should be required to the core functionality. The feature will continue to operate exactly as it does today. ## Related Issues/Epics * Original implementation epic: &amp;9825 * Documentation: https://docs.gitlab.com/user/packages/container_registry/immutable_container_tags ---
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