{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-30T02:27:32.885887+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 521, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-30T02:27:32.885887+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 342s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-30T02:27:31.590084+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-30T02:21:49.285452+00:00", "silent_for_seconds": 342.3, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-30T02:27:31.590084+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "74.6GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-30T02:21:49.049451+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 80089554944, "pct_free": 32.68, "free_gb": 74.59, "runway_days": null, "slope_gb_per_day": 0.612, "total_gb": 228.27, "samples": 2011, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-29T14:03:07.666438+00:00", "held_seconds": 44321.4, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 15.3h ago", "source": "brief-send-log.jsonl", "read_at": "2026-09-30T02:21:49.049860+00:00", "detail": {"row_count": 50, "window_hours": 30.0, "last_send_at": "2026-09-29T11:02:35.766706+00:00", "age_hours": 15.32, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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