I'd second what @bertabcd1234 has said. Monitoring battery devices for battery failure is quite useful. I find I have some contact sensors that start at 100% and are still at 100% when they stop reporting because the battery is dead. So I monitor inactivity and battery level side by side.
My "Office Door" is looking dodgy there, if it gets to 24 hours it's dead for sure.
Unless you are having problems with your Zigbee mesh (things not operating) it probably isn't worth worrying about it as fault tolerance is built into it.
If you are curious about what is happening on a repeater you can try my Zigbee Monitor Driver which will show you all the neighbors, children, LQI etc
[RELEASE] Zigbee Monitor Driver - Like XRAY Vision for Zigbee Repeaters and simple Switches There is a substantial difference in signal strength between different manufacturers devices.
Because I wrote the Zigbee monitor driver and Tile Builder I have ignored my own advice and keep a view of my Zigbee data (from the driver) which is updated hourly. Fortunately, after some rework and getting rid of some poor repeaters my Zigbee mesh is now very solid except for a couple of 3rd Reality devices but their signal is so poor they don't have any children.
