A metric registered with learn_normal() gets, for every resource reporting it, a usual hold (the 90th percentile across past days of each hour's p95) and a usual peak for each slot: - an hour of the day once 5 days of history exist; - an hour of the week once history reaches back 3 weeks, so weekly jobs are learned too. Each slot takes in the hours either side, so a job that runs a little late stays normal. One SQL statement relearns everything hourly into metric_norms, from the rollup plus the raw window not rolled up yet; norms_at() reads the slot a moment falls in. Nothing is registered yet: Traefik (#5741) and hosts (#5742) opt in. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>