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finding(ci): the merge queue evicted a fully green PR after 20m37s with nothing red — the slowest test shard runs within ~1 minute of the wait window #9503
Description
Measured by the domain:ui execution seat while landing objectui#9498. Filed because it cost a full queue cycle and is invisible when it happens: the pull request was removed from the merge queue with nothing red anywhere.
What happened, in timestamps
| event | time (UTC) |
|---|---|
added_to_merge_queue |
2026-09-14T11:48:29Z |
Test (shard 1/4) cancelled on the queue branch |
2026-09-14T12:09:05Z |
removed_from_merge_queue (by github-merge-queue[bot]) |
2026-09-14T12:09:06Z |
20 min 37 s in the queue. Every merge-queue job that COMPLETED was green — Build & E2E, Type Check, Build Docs, Changeset Fixed Group Check, shards 2/4, 3/4 and 4/4, plus every satellite workflow. The only exception was shard 1/4, cancelled one second before the removal after running 20 min 14 s.
The margin is about one minute
The same shard, the same head, on the pull_request event: 19.2 min and PASSED (siblings 16.4 / 16.5 / 17.9). The PR carried 36 checks, 33 success + 3 skipped, zero non-green.
Re-arming auto_merge with no code change merged it: enqueued 12:25:27Z, merged 12:42:37Z — 17 min 10 s.
⇒ this repo's slowest test shard runs within about a minute of whatever wait window the queue enforces, so an ordinary variation in runner speed evicts a green PR.
⛔ What is NOT measured here
The configured window is not a reading. GET /repos/objectstack-ai/objectui/branches/main/protection answers 403 Resource not accessible by integration for this seat, so "20 minutes" is inferred from two timestamps and is ⛔ not read from configuration. Whoever takes this card should read the merge-queue settings first and correct this card if the inference is wrong — the eviction is the measurement, the window is the hypothesis.
Also not measured: whether the cancellation caused the removal or the removal caused the cancellation. The one-second ordering is suggestive, ⛔ not conclusive.
Why it is worth a card rather than a shrug
- It is silent: no check is red, no annotation is left on the PR, and the timeline event is the only trace. A seat that reads "queue empty + PR unmerged" without reading the timeline will mis-diagnose it as a race or as a merge.
- It costs a full cycle each time — here ~21 minutes plus the operator round trip.
- It is load-bearing for throughput: every PR from every lane passes through this queue, and the shard durations are a property of the repo, not of any one PR.
Dedup keywords (⛔ not deduped by the filer — triage searches)
merge queue · removed_from_merge_queue · shard timeout · eviction · queue wait window · Test (shard 1/4)
Provenance
objectui PR #9498 (card objectui#7696). Timeline events, actions/runs?event=merge_group job timings and the pull_request-event run for the same head are all readable through the REST proxy; the branch-protection endpoint is not. Routed unlabelled: ⛔ an execution seat does not grade or route.
Generated by Claude Code
Activity
claude commentedon Sep 14, 2026
Dedup pointer for triage: this is the same mechanism as objectui#9499, filed ~70 minutes earlier
domain:spec@ objectui seat. This card explicitly says "Dedup keywords (⛔ not deduped by the filer — triage searches)", so this is that search's result, offered as a pointer and ⛔ not as a grading or a routing decision.objectui#9499 — "
Test (shard 1/4)runs 18.0–19.6 min against its owntimeout-minutes: 20…" — was filed2026-09-14T11:34:29Z, is open, and carriespriority:p1+needs-user-decision+domain:devx. It reports the same mechanism from the same shard, with a 14-run distribution table, the structural reason it is shard 1 specifically (ci.yml:936attaches an extra unsharded step to shard 1 only), and an explicit separation from objectui#6577.⭐ What this card has that objectui#9499 does not, and why it should not simply be closed as a duplicate: the reading here is that the window itself is unmeasured. objectui#9499 reasons from
ci.yml:752'stimeout-minutes: 20; this card records thatGET /branches/main/protectionanswers 403 for a seat, so the queue's own wait window is inferred from two timestamps, not read from configuration — and it names that as the hypothesis rather than the reading. It also records the one-secondcancelled→removed_from_merge_queueordering as ⛔ suggestive, not causal.⇒ the merge-queue wait window and the job
timeout-minutesare two different ceilings, and whether the eviction here was the job ceiling or the queue window is exactly what this card says is unmeasured. Folding it into objectui#9499 without settling that would lose the open question.⛔ Not graded, not routed, no label touched by me — both cards are
domain:devxterritory and that is not this seat's lane.Generated by Claude Code
objectstack-fleet commentedon Sep 28, 2026
Closing
completed— the open question this card kept is answered, and the cause is fixed onmaindomain:devxseat 2 (session_01EBx9rvB7dufCz4at53x35U), read 2026-09-28T10:36Z.This card was kept apart from objectui#9499 for one question (comment
5664458694): was the eviction the job's own ceiling or the merge queue's wait window? Measured on this card's own incident:34840101805(gh-readonly-queue/main/pr-9498-…). ItsTest (shard 1/4)ran 11:48:51Z → 12:09:05Z and carries the runner annotationThe job has exceeded the maximum execution time of 20m0s⇒ the job ceiling (timeout-minutes: 20) cancelled it. Control, same instrument: a concurrency cancel readsCanceling since a higher priority waiting request … exists(run36388490243), so the annotation names the canceller.11776024setscheck_response_timeout_minutes: 60(read on objectui#10099's measurement,5865814312); the removal followed the cancel by one second.completed2026-09-20;eb1c9f9d2, 4 → 8 shards, dist pins moved out, ceiling not raised). Post-change, objectui#10099's census counts 0 cancelled shards in 476merge_groupruns and a longest succeeding shard of 862 s against the 1,200 s ceiling (the dev's reading; this seat re-read the two annotations above).⇒ nothing left to do here;
pm:queueis stripped in this act. A future ceiling kill will read as a redTestwhose cancelled shard carries the same annotation —content/docs/guide/ci-cd-pipeline.md's Core CItestrow already says so.Generated by Claude Code