{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "1001.9GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-09T06:30:18.402572+00:00", "detail": {"free_bytes": 1075811217408, "free_gb": 1001.93, "total_gb": 1001.93, "pct_free": 100.0, "floor_gb": 5.0, "samples": 499, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-09T06:30:18.402572+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 574s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-09T06:30:17.047341+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-09T06:20:43.140019+00:00", "silent_for_seconds": 573.9, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-09T06:30:17.047341+00:00", 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"2026-10-09T06:16:40+00:00", "window_hours": 0.5, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-08T18:02:10.870283+00:00", "held_seconds": 44312.1, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 16.3h ago", "source": "kai-cadence-heartbeat.json", "read_at": "2026-10-09T06:20:42.947310+00:00", "detail": {"invoked_by": "distributor", "age_hours": 16.31, "last_success": "2026-10-08T14:02:10.002831+00:00", "outcome": "posted", "window_hours": 26.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-08T18:02:10.870445+00:00", "held_seconds": 44312.1, "reported_by": "kevin-mac"}, {"surface": "cron:devpost", "observation": "healthy", "method": "reported", "summary": "last success 25.7h ago", "source": "devpost-heartbeat.json", "read_at": "2026-10-09T06:20:42.947623+00:00", "detail": 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