Until now the open-alert key was (host_id, kind, resolved_at IS NULL).
A host with two source groups both failing collapsed onto one
backup_failed row — second failure bumped last_seen_at and
overwrote the message but never re-fan-out. Operators saw one
alert that appeared to flap, not two distinct broken things.
Schema changes (column-level ALTER, no rebuild):
- 0015 jobs.source_group_id (FK → source_groups, ON DELETE SET NULL,
index). Populated for backup jobs in CreateJob.
- 0016 alerts.dedup_key (NOT NULL DEFAULT ''). The old alerts_open
partial index gets dropped and replaced with a UNIQUE partial
index on (host_id, kind, dedup_key) WHERE resolved_at IS NULL —
the index is now the actual dedup primitive.
Plumbing:
- RaiseOrTouch / AutoResolve / Alert struct gain dedup_key.
- engine.JobFinishedEvent gains SourceGroupID; handleJobFinished
passes it through for backup_failed only (forget/prune/check stay
repo-scoped with key='').
- ws.handler reads SourceGroupID off the freshly-loaded job row.
- dispatchJobWithPayload gains a *string sourceGroupID arg; the
per-group Run-now path and schedule.fire path pass &g.ID.
Test coverage: TestRaiseOrTouchDedupsPerSourceGroup proves two
distinct groups produce two distinct open alerts and that resolving
one does not auto-resolve the other.
Dev tool: cmd/_fake_alert gains -dedup-key flag.
The denormalised projection was never written by the alerts code
path, so the dashboard's OPEN ALERTS card and the per-host alerts
column always read 0 regardless of how many alerts were open.
fleet.GetStats sums hosts.open_alert_count; if it never moves, the
card is decoration.
Add refreshHostOpenAlertCount that recomputes from the alerts table
(self-healing — no +/- bookkeeping to drift). Call it after the
commit in RaiseOrTouch when a row was inserted, after Resolve, and
after AutoResolve.
Caught during the live sweep: a synthetic critical raised the count
to 1, but resolving it left the dashboard reading '1 unresolved'
indefinitely.
steve