Keycloak and MySQL

• To scale the number of MySQL instances use the Verrazzano Custom Resource, not the MySQL StatefulSet. Directly modifying the StatefulSet may change the status of the cluster to ONLINE_PARTIAL.
• You must have at least one running mysql-router to access the MySQL InnoDB Cluster. Scaling the number of mysql-router instances to zero may result in the MySQL Operator permanently losing communication with the cluster and Keycloak being unable to communicate with MySQL.
• There are limitations to MySQL group replication policy to provide distributed coordination between servers. See MySQL Fault-tolerance.