Routine network upgrades are scheduled for Thursday which may result in
brief WMCS service interruptions. In particular, Wikitech and Horizon
may stop working, and instance creation/deletion/updating may briefly fail.
The network engineers have reserved a two-hour window beginning at 16:00
UTC (9 AM Pacific time). Their worst case scenario is 30 minutes of
downtime but if all goes well the interruption should not be noticeable,
just the time to unplug a cable from one switch and plug it into another.