When viewing consumer groups in the Event Streams UI, the page displays a loading indicator while it fetches the groups. However, the groups are not displayed and a 504 timeout error is shown instead.
As the number of consumer groups increases it will reach a limit where the service that retrieves the groups for the UI is unable to respond before the UI considers the request to have timed out.
Resolving the problem
Contact IBM Support to request a fix, and include issue number ES-135 in your correspondence.