I would like to do a quick maintenance on the eventlogging mysql servers for security and certificates upgrades. This means that queries done sent there will not be temporarily available. I mentioned the need for maintenance to several members of Analytics team some time ago, and would like to coordinate the stop of the eventlogging schema inserts and the queries sent there (I know not only analytics, but research, mobile and more use those databases).

Only a mere rolling restart of the database servers is needed this time, which should not cause more than 20 minutes of unavailability and will be done on each server alternatively.