{"surfaces": [{"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 744s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-13T10:29:52.504443+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-13T10:17:28.646371+00:00", "silent_for_seconds": 743.9, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-13T10:29:52.504443+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "57.6GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-13T10:17:28.407508+00:00", "detail": {"slope_gb_per_day": 0.957, "free_gb": 57.56, "free_bytes": 61799657472, "pct_free": 25.21, "samples": 2011, "floor_gb": 5.0, "runway_days": null, "total_gb": 228.27, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.827333+00:00", "held_seconds": 44277.6, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 23.2h ago", "source": "brief-send-log.jsonl", "read_at": "2026-10-13T10:17:28.407792+00:00", "detail": {"age_hours": 23.23, "row_count": 63, "last_send_at": "2026-10-12T11:03:23.591696+00:00", "window_hours": 30.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.827601+00:00", "held_seconds": 44277.6, "reported_by": "kevin-mac"}, {"surface": "cron:gcal-sync", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "gcal-sync-heartbeat.json", "read_at": "2026-10-13T10:17:28.407847+00:00", "detail": {"age_hours": 0.12, "last_success": "2026-10-13T10:10:01.870444+00:00", "window_hours": 1.0, "withheld": ["collector_id", "counts", "received_at", "reported_method", "skipped", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.827795+00:00", "held_seconds": 44277.6, "reported_by": "kevin-mac"}, {"surface": "backup:baserow", "observation": "healthy", "method": "reported", "summary": "backup 2.3h old (31 retained)", "source": "infra-baserow-1:/baserow/backups", "read_at": "2026-10-13T10:17:28.561745+00:00", "detail": {"age_hours": 2.29, "newest": "baserow_backup_20261013_030001.tar.gz", "backup_count": 31, "newest_at": "2026-10-13T08:00:01+00:00", "window_hours": 26.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.908840+00:00", "held_seconds": 44277.7, "reported_by": "kevin-mac"}, {"surface": "cron:comms-freshness", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "comms-freshness-run.json", "read_at": "2026-10-13T10:17:28.562115+00:00", "detail": {"age_hours": 0.08, "last_success": "2026-10-13T10:12:52.278581+00:00", "alarm": true, "invoked_by": "scheduler", "window_hours": 1.5, "withheld": ["collector_id", "received_at", "reported_method", "stale", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.909213+00:00", "held_seconds": 44277.7, "reported_by": "kevin-mac"}, {"surface": "service:staging-queue", "observation": "healthy", "method": "reported", "summary": "last success 0.0h ago", "source": "staging-queue-heartbeat.json", "read_at": "2026-10-13T10:17:28.562180+00:00", "detail": {"age_hours": 0.03, "last_success": "2026-10-13T10:15:42+00:00", "http_code": 200, "window_hours": 0.5, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.909439+00:00", "held_seconds": 44277.7, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 20.2h ago", "source": "kai-cadence-heartbeat.json", "read_at": "2026-10-13T10:17:28.562382+00:00", "detail": {"age_hours": 20.24, "last_success": "2026-10-12T14:03:04.087541+00:00", "invoked_by": "distributor", "outcome": "posted", "window_hours": 26.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.909505+00:00", "held_seconds": 44277.7, "reported_by": "kevin-mac"}, {"surface": "cron:devpost", "observation": "healthy", "method": "reported", "summary": "last success 5.6h ago", "source": "devpost-heartbeat.json", "read_at": "2026-10-13T10:17:28.562578+00:00", "detail": {"age_hours": 5.65, "last_success": "2026-10-13T04:38:30.066333+00:00", "window_hours": 26.0, "withheld": ["collector_id", "hb_source", "received_at", "reported_method", "row", "wire_row_id"]}, "held_since": "2026-10-12T21:59:30.909708+00:00", "held_seconds": 44277.7, "reported_by": "kevin-mac"}, {"surface": "cron:digest-hackfw", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", 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