{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "1133.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-02T14:30:20.222604+00:00", "detail": {"free_bytes": 1217344913408, "free_gb": 1133.74, "total_gb": 1133.74, "pct_free": 100.0, "floor_gb": 5.0, "samples": 43, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-02T14:30:20.222604+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 367s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-02T14:30:19.138887+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-02T14:24:11.807444+00:00", "silent_for_seconds": 367.3, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-02T14:30:19.138887+00:00", 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"window_hours": 0.5, "age_hours": 0.0, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-02T02:05:57.403223+00:00", "held_seconds": 44294.2, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 0.4h ago", "source": "kai-cadence-heartbeat.json", "read_at": "2026-10-02T14:24:11.634602+00:00", "detail": {"last_success": "2026-10-02T14:01:11.952648+00:00", "window_hours": 26.0, "outcome": "posted", "age_hours": 0.38, "invoked_by": "distributor", "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-02T02:05:57.403264+00:00", "held_seconds": 44294.2, "reported_by": "kevin-mac"}, {"surface": "cron:devpost", "observation": "healthy", "method": "reported", "summary": "last success 9.8h ago", "source": "devpost-heartbeat.json", "read_at": "2026-10-02T14:24:11.634642+00:00", "detail": {"last_success": 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