The host agent writes each maintenance job once it ends, and each stretch a host was away (a reboot, a crash, lost contact, the agent restarting), kept up to date until it is back. Docker judges each snapshot: a unit on a new image, or a container recreated, is a deploy; deaths past the Thresholds crash-loop count are one crash-loop entry that later deaths extend; single restarts are recorded but hidden. An anomaly has one entry whose type follows its review: only those judged real are shown by default. A source whose record changes keeps one entry for it (record_or_update). Plugins register the records their entries point to, so an aged-out job or downtime reads "Details no longer kept". The first fill runs once per source (timeline.filled), the host agent's jobs and downtime included. get_anomaly's "what else was going on" reads the timeline for the host or resource instead of querying alerts, runs, maintenance, downtime and container deaths itself; Docker's own source keeps only starts, stops and health changes. A new kind, Observed, is for what Steward saw happen with no rule or person behind it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>