Alert rule: MySQLGaleraOutOfSync
This alert is being triggered if a Galera Cluster node is out of Sync for the past 5 minutes.
More specifically, it’s
wsrep_local_state is not
4 ("Synced"). Possible values and their meaning:
1- Joining (requesting/receiving State Transfer) - node is joining the cluster
2- Donor/Desynced - node is the donor to the node joining the cluster
3- Joined - node has joined the cluster
4- Synced - node is synced with the cluster
Steps for Debugging
See How to debug MariaDB Galera on how to determine the cluster status.