Upgrading UPM triggers all apps/applications to restart because of the licensing API provided by UPM. This can cause Jira to return 404 and other errors while the UPM upgrade is in progress, effectively causing downtime.
Depending on the plugins in the instance, this can cause 404 and 500 errors on (at least) the following pages:
- Viewing any issue
This effectively renders Jira unavailable for the time it takes to update the UPM, which can be 5-10 minutes.
As a Jira Server admin I want to update UPM, but I don't want all other apps/applications to depend on UPM.
Unfortunately there is no workaround at this time. Instances that are affected by this should have the UPM updated in a scheduled maintenance window.