I just had an idea so don't shoot me for it I only have those once or twice a year.

I was wondering if it is possible to have a overview of all the clients with their last connect time to the boinc servers.

Is it possible to add a last connect time column as an addition for the current device list or device configuration part.
This can be done by either adding a column in the current overview or by replacing the "Date Installed & Registered" with the last connect time of the device to the grid.
The "Date Installed & Registered" is already available in the "device configuration" part. Such "last connect time" field would make much more sense for a quick overview of you installed/ registerd devices to see if they are still running as they should.

But if somebody else has a better idea to see if all the devices are still running as they should let me know.