{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "377.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-03T00:28:25.639093+00:00", "detail": {"free_bytes": 405603655680, "free_gb": 377.75, "total_gb": 377.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 60, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-10-03T00:28:25.639093+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 92s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-03T00:28:24.583486+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-03T00:26:52.410162+00:00", "silent_for_seconds": 92.2, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-03T00:28:24.583486+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "65.0GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-03T00:26:52.049512+00:00", "detail": {"free_bytes": 69836767232, "total_gb": 228.27, "runway_days": null, "slope_gb_per_day": 1.604, "samples": 2011, "free_gb": 65.04, "pct_free": 28.49, "floor_gb": 5.0, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-02T12:08:37.115716+00:00", "held_seconds": 44294.9, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 13.0h ago", "source": "brief-send-log.jsonl", "read_at": "2026-10-03T00:26:52.049755+00:00", "detail": {"window_hours": 30.0, "row_count": 53, "last_send_at": "2026-10-02T11:24:36.780355+00:00", "age_hours": 13.04, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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