{"surfaces": [{"surface": "collector:kevin-mac", "observation": "healthy", "method": "local_artifact", "summary": "collector kevin-mac last reported 522s ago, inside its declared 1800s deadline", "source": "verify:collector_liveness", "read_at": "2026-10-16T02:28:59.092312+00:00", "detail": {"liveness": "live", "cadence_seconds": 900.0, "silent_after_seconds": 1800.0, "last_report_at": "2026-10-16T02:20:17.239960+00:00", "silent_for_seconds": 521.9, "withheld": ["collector_id", "declared_surfaces"]}, "held_since": "2026-10-16T02:28:59.092312+00:00", "held_seconds": 0.0}, {"surface": "host:mac/disk", "observation": "healthy", "method": "reported", "summary": "53.2GB free, not shrinking", "source": "statvfs:/", "read_at": "2026-10-16T02:20:16.964116+00:00", "detail": {"free_gb": 53.2, "pct_free": 23.31, "slope_gb_per_day": 0.258, "runway_days": null, "floor_gb": 5.0, "total_gb": 228.27, "samples": 2011, "free_bytes": 57125638144, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.313855+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "cron:morning-brief", "observation": "healthy", "method": "reported", "summary": "brief sent 15.3h ago", "source": "brief-send-log.jsonl", "read_at": "2026-10-16T02:20:16.964487+00:00", "detail": {"window_hours": 30.0, "row_count": 66, "last_send_at": "2026-10-15T11:02:30.411105+00:00", "age_hours": 15.3, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.314258+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "cron:gcal-sync", "observation": "healthy", "method": "reported", "summary": "last success 0.0h ago", "source": "gcal-sync-heartbeat.json", "read_at": "2026-10-16T02:20:16.964542+00:00", "detail": {"last_success": "2026-10-16T02:20:01.333203+00:00", "window_hours": 1.0, "age_hours": 0.0, "withheld": ["collector_id", "counts", "received_at", "reported_method", "skipped", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.314438+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "backup:baserow", "observation": "healthy", "method": "reported", "summary": "backup 18.3h old (31 retained)", "source": "infra-baserow-1:/baserow/backups", "read_at": "2026-10-16T02:20:17.106929+00:00", "detail": {"backup_count": 31, "window_hours": 26.0, "newest_at": "2026-10-15T08:00:00+00:00", "newest": "baserow_backup_20261015_030000.tar.gz", "age_hours": 18.34, "withheld": ["collector_id", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.442739+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "cron:comms-freshness", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "comms-freshness-run.json", "read_at": "2026-10-16T02:20:17.107282+00:00", "detail": {"age_hours": 0.12, "last_success": "2026-10-16T02:13:18.426227+00:00", "window_hours": 1.5, "invoked_by": "scheduler", "alarm": true, "withheld": ["collector_id", "received_at", "reported_method", "stale", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.443063+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "service:staging-queue", "observation": "healthy", "method": "reported", "summary": "last success 0.1h ago", "source": "staging-queue-heartbeat.json", "read_at": "2026-10-16T02:20:17.107498+00:00", "detail": {"http_code": 200, "last_success": "2026-10-16T02:16:47+00:00", "window_hours": 0.5, "age_hours": 0.06, "withheld": ["collector_id", "probe", "received_at", "reported_method", "wire_row_id"]}, "held_since": "2026-10-15T14:01:48.443124+00:00", "held_seconds": 44308.7, "reported_by": "kevin-mac"}, {"surface": "cron:kai-cadence", "observation": "healthy", "method": "reported", "summary": "last success 9.8h ago", "source": "kai-cadence-heartbeat.json", "read_at": 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