#5768 "A maintenance cadence: a group's updates and reboots, one host at a time, on a schedule". A plan names an inventory group, a weekday and time in a time zone, a window and a reboot policy (only when required by default). At its slot a run takes the group's hosts in order and gives each a #5767 maintenance job. The next host starts only when the last is back in service: its agent is posting and, for a swarm node, the node is active and every replicated service is at its replicas. A failure stops the run, and no host is started once the window has passed. A host's latest failure shows as host_agent/<host>/maintenance_failed, for an ordinary alert rule. The page is Hosts → Maintenance. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>