The Wikimedia Foundation will migrate its instance of OTRS Community Edition 6 to a maintained FOSS fork, Znuny LTS. The patch consists of rebranding, it's graphics and text changes to re-mark the software under its new name. The risk here is low, the migration is expected to go relatively quickly and painlessly.
The migration is scheduled to take place from 07:00-09:00 UTC on 13 April, OTRS/Znuny LTS will be inaccessible to agents during that time. Once complete, agents should be able to log in an resume work as normal. There will be no functional changes to the user interface or experience at this time.