{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "503.8GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-02T06:34:25.448771+00:00", "detail": {"free_bytes": 540985860096, "free_gb": 503.83, "total_gb": 503.83, "pct_free": 100.0, "floor_gb": 5.0, "samples": 385, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-02T06:34:25.448771+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 736s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-02T06:34:24.390008+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-02T06:22:08.585800+00:00", "silent_for_seconds": 735.8, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-02T06:34:24.390008+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "59.8GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-02T06:22:07.551479+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 64212025344, "samples": 2011, "total_gb": 228.27, "free_gb": 59.8, "runway_days": null, "slope_gb_per_day": 1.456, "pct_free": 26.2, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-01T18:03:40.279509+00:00", "held_seconds": 44307.3, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 19.3h ago", "source": "brief-send-log.jsonl", "read_at": "2026-10-02T06:22:07.565564+00:00", "detail": {"window_hours": 30.0, "row_count": 52, "age_hours": 19.3, "last_send_at": "2026-10-01T11:04:04.768388+00:00", "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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