{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-29T06:09:38.558489+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 339, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-29T06:09:38.558489+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 519s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-29T06:09:37.255104+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-29T06:00:58.579667+00:00", "silent_for_seconds": 518.7, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-29T06:09:37.255104+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "75.2GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-29T06:00:58.306901+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 80718659584, "pct_free": 32.93, "free_gb": 75.18, "runway_days": null, "slope_gb_per_day": 0.17, "total_gb": 228.27, "samples": 2011, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-28T17:42:34.839188+00:00", "held_seconds": 44303.5, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 18.9h ago", "source": "brief-send-log.jsonl", "read_at": "2026-09-29T06:00:58.307474+00:00", "detail": {"row_count": 49, "window_hours": 30.0, "last_send_at": "2026-09-28T11:07:14.060278+00:00", "age_hours": 18.9, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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