Due to hardware malfunction (T213664) on the primary s4 database master (Commonswiki) and given that that host is old and needs to be decommissioned (T217396) we have to do a database master failover.
We would need a 30 minutes read-only window for Commonswiki
Date: Wed 19th June
Time: 05:00 AM UTC - 05:30 AM UTC (we expect not to use the full 30 minutes window)
Impact: All Commonswiki will go read-only. No edits will be allowed. Reads will not be impacted.