Implement disk usage reporting for the administrator
|Velocity based estimate||-|
The current report is no longer updated by the backend job that used to do it, so we need something to replace this. The columns in the current report include:
User Collections Read Size Collections Persisted Storage Measured At Total (unweighted) Shared (weighted) Total (unweighted) Shared (weighted)
With the addition expired/trashed collections, we probably want to report stats on that as well to show how much space is available to be reclaimed/garbage collected and perhaps what will be expiring "soon."