Review what GitHub Actions cancels in a concurrency group

Name the behavior under review

This review is for delivery teams preventing obsolete builds from deploying. Start with one observable claim: map workflow and job concurrency keys to the runs they queue or cancel. Record the repository revision, environment, test identity, time source, and reviewer.

Keep the first run small. A teammate in another time zone should be able to repeat it without reconstructing assumptions from chat.

Capture an ordinary run

Save event, ref, workflow, group expression, run ID, job state, cancellation time, and deployment state. Use synthetic or approved test data and avoid broad production access. The baseline is useful only when its inputs and expected outcome are written down.

If the baseline fails, repair the fixture or narrow the question before adding timing, load, or failure conditions.

Review record

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Exercise the boundary case

Test the case most likely to expose a bad assumption: a manual hotfix shares a group with an automatic branch run. Change one condition, preserve raw output, and timestamp both the trigger and result.

Repeat the nearest passing case after the failure. That comparison is more useful than a pile of unrelated logs.

Make the smallest supported correction

Trace the evidence to the first boundary that violates the stated behavior. Add a focused regression check, prepare a reversible correction, and rerun both cases.

Record adjacent risks separately, with an owner and a reason they remain outside this change.

Hand off the decision

An offshore developer can design fixtures, inspect code, prepare a patch, and assemble evidence. The internal owner retains protected credentials, sensitive data, exceptions, and production release authority.

The handoff names revisions, changed files, commands, passed and skipped checks, rollback, remaining uncertainty, and the next owner.

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