As a System Administrator, I would like to be able to see usage statistics for each board

As the administrator of a large instance, I have hundreds of agile boards to oversee. Many of these boards are old, unused or were created by users to test something and then abandoned.

I would like a way to see the usage of each board (either by last date accessed or by number of users accessing the board) so that I can better determine at a glance if a board is active or inactive.