I've got a bunch of devices like tablets and phones that regularly come and go. They're all on DHCP leases (as is everything else on the network).

Is there a way to configure them as "known, but not monitored"?

As in, don't send me "Non-monitored IP address on the network" messages? While keeping that feature active for any unexpected ones?

That and leaving them out of regular detection would seem useful as a way to avoid wasting the resources checking for them when they're gone a lot of the time.