Mechanism for letting clients know when they are not being used

[dsu-igeek]

It would be nice to be able to close connections to servers and release resources there when they are not needed. Consider mechanisms for hinting to the Protected Entities/Protected Entity Type Managers that there is no outstanding usage and they could release resources.

[dsu-igeek]

@ifraixedes from Tardigrade Velero plug-in expressed interest in this capability.