System heartbeat
Live freshness of every data pipeline behind the Observatory. Fresh, Warning, or Stale — so a silently dead pipeline is caught in hours, not weeks.
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Status thresholds
Sources: governance ETL freshness from /data/snapshots/meta.json (last_run + data_through); market poller & API liveness from /health on the Data Layer API. This page auto-refreshes. Recovery procedure: see HEARTBEAT_MONITOR.md.