bal_state monitor the subcluster level load balance state using gslb.
| Monitor Item | Description |
|---|---|
| ERR_BK_NO_BACKEND | Counter for no backend found |
| ERR_BK_NO_SUB_CLUSTER | Counter for no sub-cluster found |
| ERR_BK_NO_SUB_CLUSTER_CROSS | Counter for no cross sub-cluster found |
| ERR_BK_RETRY_TOO_MANY | Counter for reaching retry max times |
| ERR_GSLB_BLACKHOLE | Counter for denying by blackhole |