{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-28T18:29:48.495384+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 231, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-28T18:29:48.495384+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 119s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-28T18:29:47.136233+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-28T18:27:47.736942+00:00", "silent_for_seconds": 119.4, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-28T18:29:47.136233+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "82.6GB free, 651 days of runway", "source": "statvfs:/", "read_at": "2026-09-28T18:27:47.399999+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 88653459456, "pct_free": 36.17, "free_gb": 82.56, "runway_days": 650.8, "slope_gb_per_day": -0.119, "total_gb": 228.27, "samples": 2011, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T06:09:25.068680+00:00", "held_seconds": 44302.3, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 7.3h ago", "source": "brief-send-log.jsonl", "read_at": "2026-09-28T18:27:47.400475+00:00", "detail": {"row_count": 49, "window_hours": 30.0, "last_send_at": "2026-09-28T11:07:14.060278+00:00", "age_hours": 7.34, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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