The same Holding as the SNMP poll, for the rest of Steward's own collectors: - Monitors: the list is read within 10 s or the last one read stands in; a start the database doesn't take is kept in memory, so a monitor isn't checked twice; each result is held and stored at the time it was checked. A stall shows on the monitors as the checks it saw, not a gap. - UniFi and Traefik: each poll's writes are held (hold_write) and run oldest first in one transaction; every reading is stamped with its scrape. - A held round the database refuses (as opposed to can't be reached) is stored alone and let go, so it can't hold up every round after it. The Prometheus scrape is left as it is: its one target, Fabled Archives, keeps its own database on the same NFS. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>