Lenses is not listing all consumer groups of a topic even though the user has the correct permissions in the User Group.
How can I resolve this and how does Lenses map the permissions to topics & consumer groups?
Lenses will only display a consumer group if the user has permission to view all topics associated with that group. This is based on the namespace you would have configured for the Group associated with your user account.
For example, a user in this Group will have permissions to view all topics beginning with red*
If the Consumer Groups you want to monitor are associated with this/these topics, you should be able to see them.