Next Thursday we'll be upgrading to OpenStack version 'Queens' starting
at 15:00 UTC.
The upgrade will take a couple of hours. During the upgrade process,
Horizon (and associated OpenStack APIs) will be disabled. There may
also be brief network interruptions during the upgrade.
Toolforge and existing VMs should be largely unaffected if all goes well
-- there may be some service interruption if we encounter networking issues.
- Andrew + the WMCS team