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Aleksei Sviridkin
e0d6c6be92
A run joins its concurrency group before any job-level `if` is evaluated, so `prepare`'s guard cannot stop a label event from disturbing the run already backporting a PR. Labels set with the default GITHUB_TOKEN start no run, but labels set by third-party GitHub Apps do, and they arrive in bursts, so each one cancelled the backport the merge had just started. The delivery survived anyway, which is why this went unnoticed: the old guard admitted a run on the PR's cumulative labels, so the last label of a burst requalified and redid the work. In the bursts on record the kill lands within seconds, well before the cherry-pick, so the cost was a restart rather than a lost backport. Move a label event that requests no backport into a group of its own, and let one that does request a backport queue rather than cancel. Both halves are needed. `backport` and `backport-previous` are separate requests that both have to complete, so they share a group and must not cancel each other, while every other label does no work here and only has to stay out of the way. Scope `prepare` to the labels each trigger is entitled to read at the same time. Reading the cumulative label set on a `labeled` event let any later unrelated label on a merged PR still carrying `backport` re-enter the job to redo a backport already delivered. That redo is also what redelivered a killed backport, so narrowing the guard alone would turn a noisy delivery into a missing one: neither change is safe to land without the other. Bound both jobs with `timeout-minutes` for the same reason, since a queued request now waits on the run ahead of it rather than replacing it. The ceiling bounds execution and not the wait for a runner, which no job-level key reaches, so 30 is generous rather than calculated: every execution measured on this workflow has been seconds, against minutes of queue that nothing here can bound. Document the recovery path the narrowing removes: with no accidental re-run left, re-applying whichever backport label the PR already carries is how an operator retries a merge-triggered run that died. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Aleksei Sviridkin <3811295@gmail.com>