{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-28T00:28:02.638202+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 69, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-28T00:28:02.638202+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 304s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-28T00:28:01.263182+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-28T00:22:57.259503+00:00", "silent_for_seconds": 304.0, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-28T00:28:01.263182+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "83.3GB free, 117 days of runway", "source": "statvfs:/", "read_at": "2026-09-28T00:22:57.008197+00:00", "detail": {"floor_gb": 5.0, "free_bytes": 89486561280, "pct_free": 36.51, "free_gb": 83.34, "runway_days": 116.7, "slope_gb_per_day": -0.671, "total_gb": 228.27, "samples": 2011, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-27T12:09:11.489622+00:00", "held_seconds": 44025.5, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 13.4h ago", "source": "brief-send-log.jsonl", "read_at": "2026-09-28T00:22:57.008464+00:00", "detail": {"row_count": 48, "window_hours": 30.0, "last_send_at": "2026-09-27T11:01:25.939225+00:00", "age_hours": 13.36, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": 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["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-27T12:09:11.583424+00:00", "held_seconds": 44025.5, "reported_by": "kevin-mac"}, {"surface": "cron:comms-freshness", "observation": "healthy", "method": "reported", "summary": "last success 0.3h ago", "source": "comms-freshness-run.json", "read_at": "2026-09-28T00:22:57.076065+00:00", "detail": {"window_hours": 1.5, "last_success": "2026-09-28T00:07:08.530187+00:00", "age_hours": 0.26, "invoked_by": "interactive", "alarm": true, "withheld": ["collector_id", "received_at", "reported_method", "stale", "wire_row_id"]}, "held_since": "2026-09-27T12:09:11.584060+00:00", "held_seconds": 44025.5, "reported_by": "kevin-mac"}, {"surface": "service:staging-queue", "observation": "healthy", "method": "reported", "summary": "last success 0.0h ago", "source": "staging-queue-heartbeat.json", "read_at": "2026-09-28T00:22:57.076117+00:00", "detail": {"http_code": 200, "last_success": "2026-09-28T00:22:00+00:00", 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