// aggregated health across cluster nodes
// includes: workers, replicas, edge proxies
{
  "cluster": "prod-eu",
  "status": "healthy",
  "members_total": 17,
  "members_healthy": 17,
  "members_unhealthy": 0,
  "quorum": true,
  "leader": "node-04.prod-eu",
  "leader_since": "2026-04-12T19:48:21Z",
  "members": [
    { "id": "node-01", "role": "replica", "status": "healthy", "lag_ms": 12 },
    { "id": "node-02", "role": "replica", "status": "healthy", "lag_ms": 8  },
    { "id": "node-03", "role": "replica", "status": "healthy", "lag_ms": 17 },
    { "id": "node-04", "role": "leader",  "status": "healthy", "lag_ms": 0  },
    { "id": "node-05", "role": "replica", "status": "healthy", "lag_ms": 14 }
  ],
  "checks": {
    "raft_quorum":      "pass",
    "replica_lag":      "pass",
    "disk_pressure":    "pass",
    "network_partition":"pass",
    "backup_age":       "pass"  // 4h 12m
  },
  "counters": {
    "requests_5m":     94217,
    "errors_5m":       18,
    "error_rate_pct":  0.019
  },
  "degraded": false,
  "maintenance": false,
  "timestamp": "2026-05-19T14:14:55Z"
}