{"surfaces": [{"surface": "host:disk/", "observation": "healthy", "method": "local_artifact", "summary": "755.7GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-09-28T04:25:21.743145+00:00", "detail": {"free_bytes": 811478913024, "free_gb": 755.75, "total_gb": 755.75, "pct_free": 100.0, "floor_gb": 5.0, "samples": 105, "slope_gb_per_day": 0.0, "runway_days": null}, "held_since": "2026-09-28T04:25:21.743145+00:00", "held_seconds": 0.0}, {"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 83s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-09-28T04:25:20.699292+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-09-28T04:23:58.081825+00:00", "silent_for_seconds": 82.6, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-09-28T04:25:20.699292+00:00", 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"last_success": "2026-09-28T04:07:01.337450+00:00", "age_hours": 0.28, "withheld": ["collector_id", "hb_source", "received_at", "reported_method", "row", "wire_row_id"]}, "held_since": "2026-09-27T16:10:14.173014+00:00", "held_seconds": 44023.8, "reported_by": "kevin-mac"}, {"surface": "cron:digest-hackfw", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "index.html.heartbeat.json", "read_at": "2026-09-28T04:23:57.933817+00:00", "detail": {"window_hours": 1.0, "brand": "hackfw", "age_hours": 0.07, "last_success": "2026-09-28T04:20:01.228574+00:00", "bytes": 42714, "changed": false, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-09-27T16:10:14.173087+00:00", "held_seconds": 44023.8, "reported_by": "kevin-mac"}, {"surface": "cron:digest-tmb", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "tmb-index.html.heartbeat.json", "read_at": 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