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Milestone 422 step 4. Rule 27: no UI, no ship. This is where the previous three steps become usable. REACHABLE AT: Settings -> Activity -> Worker lanes, directly under the "Queues + workers" pane. Written from opening the view, not from memory of having built it — lesson #4282, and #3463 is the same trap landing inside milestone 365, where the System page shipped with no navigation to it. Under that pane deliberately, not in the System tab. System answers "is everything running", where every control would be about something broken. This is about something working that should work harder, and it belongs beside the backlog it reacts to: you watch a queue grow and give that lane another slot without leaving the pane. Per lane: queues, pending, busy, a stepper, an enable switch. - PENDING is depth + reserved, not LLEN. Celery prefetches, so LLEN alone reads 0 while a worker holds tasks in memory — the number that would make someone think a buried lane was idle. - NOT ANSWERING, never "stopped". present=false means nothing replied; saying stopped would send the operator looking for a crash that has not happened. - THE CEILING IS ON SCREEN, with "(memory)" on the ML lane. It is the one number here the operator cannot change, so it has to justify itself; a greyed stepper with no explanation reads as a bug. - `busy` is per lane, so adjusting one does not freeze the others. TWO OUTCOMES THAT MUST NOT COLLAPSE INTO ONE MESSAGE. A stored-but-unpushed change (applied:false — the lane is restarting) is information: the value is saved and the reconcile will carry it, so the card says so and invites waiting. A refused value (400) is an error and shows the endpoint's own sentence. Collapsing them would make one of the two invite the wrong action. A BUG CAUGHT BEFORE COMMIT: the card read `e.detail?.detail`, but ApiError puts the parsed body on `.body` and `.message` on the short `error` key. It would have shown the operator the bare word "refused" with no reason — the exact failure that line exists to prevent. The test would not have caught it either: `rejects.toThrow()` passes whether the sentence is reachable or not. It now asserts `err.body.detail` specifically. Also: queueOptions in SystemActivityTab was a fourth hand-kept copy of the queue list and had drifted — `maintenance_long` was missing, so activity on that lane could not be filtered for at all despite four task routes pointing there. Added, and DELIBERATELY left as a written-out list rather than derived like the other three were: this filters task_run HISTORY, so a derived list would hide the filter for any queue that has rows but no longer has a lane — precisely when someone is looking — and would be empty whenever the endpoint is down. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR