Hello!
The Wikimedia datacenter team will be performing some routine network maintenance[1] next Wednesday. This will cause brief, rolling network interruptions for essentially all tools, services, and virtual servers -- each physical server will be briefly unplugged as its network cable is moved to a new switch. Ideally these interruptions will only last a few seconds and be unnoticeable, but downtime may be longer if there are unexpected complications.
This process will begin at 14:00 UTC on Wednesday the 24th, which is 7 AM in California. All moves should be completed within an hour.
-Andrew