Per T187962, the toolsdb and wikilabels servers (labsdb1005/labsdb1004) are moving. This task to coordinate the considerable user impact likely for services that depend on toolsdb (since during a failover, some tables don't https://wikitech.wikimedia.org/wiki/Help:Toolforge/Database#ToolsDB_Backups_and_Replication). wikilabels is not replicated and will thus take an outage during this move.
Proposed dates are July 10th for labsdb1004 and July 11th for labsdb1005.
For what is worth: in production the impact was just a few seconds of unavailability, less than 10 seconds even for the primary db master that we did (db1061)
Same as T197246, should we take the chance to upgrade to stretch/mariaDB 10.1? If not, when?
@jcrespo -- With some issues around the RAID still giving me trouble, we could perhaps do that stretch upgrade when we move to VMs. Otherwise, would that draw out the service impact a lot? Databases would need to come down during it, I presume, and perhaps we can do that.