{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-28T22:30:50.547252+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 271, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-28T22:30:50.547252+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 113s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-28T22:30:49.608164+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-28T22:28:56.438667+00:00", "silent_for_seconds": 113.2, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-28T22:30:49.608164+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "78.1GB free, 8310 days of runway", "source": "statvfs:/", "read_at": "2026-09-28T22:28:56.242412+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 83838754816, "pct_free": 34.2, "free_gb": 78.08, "runway_days": 8309.6, "slope_gb_per_day": -0.009, "total_gb": 228.27, "samples": 2011, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T10:10:25.870221+00:00", "held_seconds": 44310.4, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 11.4h ago", "source": "brief-send-log.jsonl", "read_at": "2026-09-28T22:28:56.242486+00:00", "detail": {"row_count": 49, "window_hours": 30.0, "last_send_at": "2026-09-28T11:07:14.060278+00:00", "age_hours": 11.36, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001083+00:00", "held_seconds": 44310.3, "reported_by": "kevin-mac"}, {"surface": "cron:comms-freshness", "observation": "healthy", "method": "reported", "summary": "last success 0.4h ago", "source": "comms-freshness-run.json", "read_at": "2026-09-28T22:28:56.307714+00:00", "detail": {"window_hours": 1.5, "last_success": "2026-09-28T22:07:18.414553+00:00", "age_hours": 0.36, "invoked_by": "interactive", "alarm": true, "withheld": ["collector_id", "received_at", "reported_method", "stale", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001397+00:00", "held_seconds": 44310.3, "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": "2026-09-28T22:28:56.307759+00:00", "detail": {"http_code": 200, "last_success": "2026-09-28T22:27:22+00:00", "age_hours": 0.03, "window_hours": 0.5, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001460+00:00", "held_seconds": 44310.3, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 6.0h ago", "source": "kai-cadence-heartbeat.json", "read_at": "2026-09-28T22:28:56.307801+00:00", "detail": {"window_hours": 26.0, "last_success": "2026-09-28T16:30:07.366696+00:00", "age_hours": 5.98, "outcome": "posted", "invoked_by": "cadence", "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001659+00:00", "held_seconds": 44310.3, "reported_by": "kevin-mac"}, {"surface": "cron:devpost", "observation": "healthy", "method": "reported", "summary": "last success 0.4h ago", "source": "devpost-heartbeat.json", "read_at": "2026-09-28T22:28:56.307841+00:00", "detail": {"window_hours": 26.0, "last_success": "2026-09-28T22:07:05.535752+00:00", "age_hours": 0.36, "withheld": ["collector_id", "hb_source", "received_at", "reported_method", "row", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001844+00:00", "held_seconds": 44310.3, "reported_by": "kevin-mac"}, {"surface": "cron:digest-hackfw", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "index.html.heartbeat.json", "read_at": "2026-09-28T22:28:56.307889+00:00", "detail": {"window_hours": 1.0, "brand": "hackfw", "age_hours": 0.15, "last_success": "2026-09-28T22:20:01.555238+00:00", "bytes": 42714, "changed": false, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T10:10:26.001901+00:00", "held_seconds": 44310.3, "reported_by": "kevin-mac"}, {"surface": "cron:digest-tmb", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "tmb-index.html.heartbeat.json", "read_at": 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