GitHub announced this deadline on June 12, and the July 31 cutoff is now inside a month. Any self-hosted runner that hasn't been updated to the minimum supported version will simply stop getting jobs that day — no graceful fallback, no warning at job time. If you manage self-hosted runners, the move is to pull `actions/runner` release notes, confirm your installed versions, and schedule upgrades before month-end. The enforcement scope is currently GitHub Enterprise Cloud with Data Residency; check the changelog for whether your tier is included.