* - loadMonitor : Name of a class used to fetch server lag and load.
* - readOnlyReason : Reason the master DB is read-only if so [optional]
* - waitTimeout : Maximum time to wait for replicas for consistency [optional]
* - loadMonitor : Name of a class used to fetch server lag and load.
* - readOnlyReason : Reason the master DB is read-only if so [optional]
* - waitTimeout : Maximum time to wait for replicas for consistency [optional]