Ships WITH agent v0.121.0, not after it. The agent now proves a tier once per
ARCHIVE GENERATION, so a weekly tier is proved weekly — in perfect health. The
flat 7-day restoreProvenStaleAfter derived its number from the 24h cadence R-86
removes, and a healthy weekly tier's proof age reaches EXACTLY 168h just before
its next proof: it sat ON the line, so any ordinary delay tipped it into a
nightly alarm about a working system.
restoreProvenWindow(tier, observed, ok):
- the tier's own archive interval, OBSERVED from reports the hub already holds
(pbs_snapshots + successful backups attributed by TARGET TYPE, slice A.4)
- x4 generations = the same tolerance the flat constant expressed
- floored at 7d (never tighter than before), capped at 12d (strictly inside the
2-week offsite retention)
- falls back to the DECLARED rhythm (26h host / 8d offsite — the thresholds the
backup-freshness checker already uses) when history is too short to observe
one; falling back to the FLOOR would recreate the false alarm on a fresh box
Kept: absence is UNKNOWN until the anchored window passes; the signal stays
edge-triggered; failed and stale remain distinct events. Every reason string now
states the window it was judged against (R-100's corollary).
Also backfills the missing v0.90.1 CHANGELOG entry (deployed since f21e7ca), and
records the operator's 2026-08-03 ruling that ep0 is Tier 2 / protected.
A failed restore-test was a [WARN] line in the ingest handler and nothing else —
no event, no notification, no gauge. True for the LOCAL tier that was already
being tested, so the loudest DR signal this system produces was inaudible.
Rotating tiers without this would only mean two tiers can fail silently
instead of one.
Two signals, deliberately NOT merged:
restore_test_failed (error) — a run completed and did NOT pass
restore_test_stale (warning) — a tier not PROVEN within its interval
Merging them collapses 'your DR is broken' into 'your DR is unverified', and
the second is the one that quietly becomes the first. The staleness wording
says 'unverified, not known-broken' and a test asserts that phrasing.
Anchored per R-81, not re-derived: a never-proven tier on a newborn box is
UNKNOWN, not FAILED, until the window elapses. This family has made the
opposite mistake three times; this monitor was written straight after the third,
so it copies R-81's structure rather than inventing a fourth shape.
restoreProvenStaleAfter = 7d is derived: oldest-first over two tiers at a 24h
cadence proves each ~every 2 days, so 7d tolerates ~3 missed opportunities and
sits inside the 2-week offsite retention.
Per-tier proof comes from the hub's retained host-report window — the agent
reports only its latest run, so the latest report alone cannot answer 'when was
the OTHER tier last proven?'. Reused R-81's mechanism instead of a wire change.
Both types registered in allowedEventTypes (R-77's inert-seam lesson) and
operator-tier only — no customerMessages entry.
FIXED a time bomb I introduced in Slice C: the restart-blind-window test
hard-coded 2026-07-18T18:31:06Z while comparing against the real clock. Harmless
under one 26h threshold; once the offsite tier got an 8-day limit it passed all
day and began failing at 18:31 UTC, exactly 8 days later. Now relative.
Red-proofs B and D observed. Full suite green (17 packages, rc=0).
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