Today (14Sept) the menus in the Device Center are missing a number of the reports etc. that we normally see, relating to ports, User tracking etc. The only problem that appears to have occured over the weekend is a CSDiscovery failure. Attached are the log files indicated in the error message.
Make sure your Data Collection filters allow for these devices to be managed under Campus Manager > ADministration > Data Collection > Mode and Policy Settings, then run a new Campus Data Collection.