What the archive expected to receive vs what it got, per source per ingest run. A gap is a fact, not a failure to hide.
solid = complete · half = partial (a named gap) · hatched = missing · red = declaration error. Pattern carries the meaning; colour only reinforces it.
A feeder shows OFF when its upstream blocked us, STALE when it's slow and we show last-known, CHECKING when it hasn't answered. We never fake a live feed. Sources: /v1/health + /v1/coverage · auto-refresh every 30s.