After upgrading to CU7, the Operator Console (OC) pages all load fine except for "Alarms" which just displays spinning circles:
Release : 20.4 CU7
Webapp alarmviewer-api failed to start
Highlight the wasp probe in Infrastructure Manager or Admin Console.
In IM, press CTRL+P. In Admin Console, select the probe menu and choose "Open Probe Utility in New Window".
Execute the callback: start_webapp
provide the parameter: alarmviewer-api
Once you see the "OK" message, refresh your browser and alarms will display.
In some cases, the issue gets resolved after resetting filters in OC, alarms Page