{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "1001.9GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-08T08:43:47.117408+00:00", "detail": {"free_bytes": 1075811217408, "free_gb": 1001.93, "total_gb": 1001.93, "pct_free": 100.0, "floor_gb": 5.0, "samples": 301, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-08T08:43:47.117408+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 846s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-08T08:43:45.780852+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-08T08:29:39.606806+00:00", "silent_for_seconds": 846.2, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-08T08:43:45.780852+00:00", 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"2026-10-08T08:26:18+00:00", "window_hours": 0.5, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-07T20:11:16.615739+00:00", "held_seconds": 44302.8, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 18.5h ago", "source": "kai-cadence-heartbeat.json", "read_at": "2026-10-08T08:29:39.433977+00:00", "detail": {"invoked_by": "distributor", "age_hours": 18.47, "last_success": "2026-10-07T14:01:11.709583+00:00", "outcome": "posted", "window_hours": 26.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-07T20:11:16.615940+00:00", "held_seconds": 44302.8, "reported_by": "kevin-mac"}, {"surface": "cron:devpost", "observation": "healthy", "method": "reported", "summary": "last success 3.9h ago", "source": "devpost-heartbeat.json", "read_at": "2026-10-08T08:29:39.434185+00:00", "detail": 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