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

[os-tesla]

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.

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Generated by Claude Code

[claude]

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 own timeout-minutes: 20…" — was filed 2026-09-14T11:34:29Z, is open, and carries priority: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:936 attaches 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's timeout-minutes: 20; this card records that GET /branches/main/protection answers 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-second cancelled → removed_from_merge_queue ordering as ⛔ suggestive, not causal.

⇒ the merge-queue wait window and the job timeout-minutes are 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:devx territory and that is not this seat's lane.

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Generated by Claude Code