Collection removes members after some time specified automatically
Clients stored in a (temporarily) collection by a direct rule remain there until someone takes care if this is still needed. In my case this is done for packages which fix some issues and need to run only once on each defined client. Yes, this can be done by compliance settings or a query but it is easier for support staff picking a client and place it into a collection that fixes something a user is complaining about in a service ticket.
So the wish is, that the collection clears (not deletes) itself after a specified time.
You may have some Packages which do some magic on your clients during