How to monitor switch / dimmer to know if it has dropped off the mesh?

I have a ZEN27 that I updated the firmware on. Apparently it needs to be excluded and re-included, OK no issue here.

However I noticed the automations, the device page and the logs are completely oblivious of the loss of this device (I've not yet gotten to exclude/include).

This is an outside light and I might not even notice it for some time. Is there a way to easily determine/monitor if the dimmer is responding to commands?

I suggest you take a look at