These HADR master servers are either unreachable or out of sync:
. If you continue, these master servers will be out of sync and you will need to sync them later. Do you still want to continue?
You can add a non-HADR master server to the Multi-Master cluster even if one or more HADR master servers are unreachable or out of sync. You need to explicitly confirm this action before proceeding.
Non-HADR master server is added only after you confirm that you want to proceed even though some of the HADR master servers are unreachable or out of sync.
Review the list of master servers that are unreachable or out of sync and proceed. You need to synchronize them later.