{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "503.8GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-01T16:40:41.389184+00:00", "detail": {"free_bytes": 540985860096, "free_gb": 503.83, "total_gb": 503.83, "pct_free": 100.0, "floor_gb": 5.0, "samples": 258, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-01T16:40:41.389184+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 444s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-01T16:40:39.228023+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-01T16:33:15.110249+00:00", "silent_for_seconds": 444.1, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-01T16:40:39.228023+00:00", 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