Q. I'm looking at the monitoring page for a Group of controllers, but the graphs are empty. What's wrong.
A. If the Group contains only controllers this is an expected behavior. We DO show AP users/bandwidth in aggregate graphs, but to make sure that data isn't double-counted we DO NOT show it for controllers.
Same for switches too, if we have a group with only switches, we show the interface graphs and switch b/w graph on its monitor page, but not on the group page to make sure we do not double count the information.