signal-health: ledger-write degraded since 2026-08-21 — ledger writes: 3 day(s) with dispatched pages missing their ledger record (1 of 5 pages dispatched 2026-08-21 have no ledger record: docs-iac-get-started-gcp-begin) — those pages' staleness clocks never advanced, so they will loop back into selection as duplicate reviews. Check the worker runs' Resolve-ledger-bucket and Record-review-ledger steps on content-review-article.yml (a cancelled worker also lands here — that's the point).