Administration -> General -> Housekeeping
Events and alerts
Network discovery data storage period (in days)

Set this to 90 days. Expectation, when I go to Monitoring -> Discovery I will only see data going back 90 days. Actual result, I have devices listed going way back...
671 days, 01:15:08

If I'm not understanding this housekeeping item, it's not clear in the documentation what it's actually supposed to be doing, and then it would be the case that we apparently still have no way to remove ancient devices that have not been seen by Discovery. Desired and expected function of this setting would be the above item having not been seen for over 90 days would be purged from the database and not appear in the Discovery list.