[9.3] [Fleet] Add upgrade_details.metadata.reason to AgentResponseSchema (#252485)#252528
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kibanamachine merged 3 commits intoelastic:9.3from Feb 10, 2026
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…lastic#252485) ## Summary `upgrade_details.metadata.reason` is missing from `AgentResponseSchema`, this PR adds it. I noticed it while testing agent upgrade rollback in dev mode, where strict body validation is enforced (this does not cause errors in production mode, but it's still missing from the OAS). Testing: roll back a recently upgraded Fleet-managed Elastic Agent. After rollback, it should be queryable in Fleet UI without error. <img width="1728" height="722" alt="Screenshot 2026-02-02 at 16 58 07" src="https://github.com/user-attachments/assets/047ab6ad-5cdd-46f0-96fe-40001ba2904a" /> ### Checklist - [x] The PR description includes the appropriate Release Notes section, and the correct `release_note:*` label is applied per the [guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process) - [x] Review the [backport guidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing) and apply applicable `backport:*` labels. --------- Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com> (cherry picked from commit 97bf115)
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