I can only get to this page if I have an active "alert" for hub database size. It takes me to <hubIP>/alerts and looks like this (I know, I know, my database is getting large; sue me):
However, this does not work for me unless there is an alert, otherwise I just get a message that there are none. You can still set these values on a per-device basis (on the device page) and via the "hidden" URL endpoints--or at least the event history size with the "hidden" URL:
<hubIP>/hub/advanced/event/limit/<desiredSize,1-1000>, for example,
http://myHubIP/hub/advanced/event/limit/100 (or just leave off the /100 to view the current size).
I'm not sure there is any other method for the "state history size" beyond the per-device method, unless something was added recently that I don't know about (or there's another way to access the above when you don't "need" it).
