List Virtual servers that are offline for past 90 days

While the TMStat data is available at the CLI, via a command like 

tmctl virtual_server_stat -s name,clientside.pkts_in,clientside.pkts_out 

Which will show you clientside traffic stats per virtual server. In the CLI, it may be a bit harder to sort the data and see the patterns of use that you care about.

This is available in iHealth in a much more consumable and interactive format.  Under the Commands menu, in the Utilities tree, you can select Virtual Server Traffic.  See the image below:

Now in that page you can sort by any column header to see which virtual servers have not seen any traffic since the last reboot or when stats were cleared on the platform.