Next Friday we'll be upgrading our OpenStack cluster. The upgrade should not interrupt any existing tools or instances, but during the upgrade it will be impossible to create, delete, or modify WMCS VMs.
I'll start the process at around 14:00 UTC (7AM PDT). The complete upgrade may take much of the day; Horizon will be disabled for the duration of this update. CI/Nodepool will function intermittently during this time.
-Andrew