ReadonlyaccrualsAccrual drain backlog: pending total (minor units, encoded) and oldest row age.
ReadonlyadvisoriesStated facts (never actions) the thresholds below produced from the gauges.
ReadonlycheckpointLatest sealed checkpoint: when, how many account heads, and its age.
ReadonlyhistoryTotal postings (newest commit sequence) — the partitioning/archival signal.
ReadonlyreproofRolling re-proof: the verified-through watermark and its age; null before the first rotation.
ReadonlyreservationsShared reservation counter footprint: accounts with a row (null = no shared counter).
ReadonlysessionsNetting journal footprint: distinct session ids, counted up to the cap (null = no gauge).
ReadonlytablesSecondary-table row counts (every value null when the store offers no size gauge): the unbounded growth surfaces the retention sweep and host policy govern.
The capacity gauges behind the scale knobs, read live from the store. Every
nullmeans the store does not offer that gauge — unknown, never zero.advisoriesare stated facts against CAPACITY_THRESHOLDS (documented, not configurable per call): the system informs, the host decides; no advisory ever changes behavior.