OBD2 Scanner/App: what sensors/values to monitor?

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2017 CX3 AWD
Do any of you keep your OBD2 scanner on to monitor values not shown on the car's dashboard? I have a spare Android phone that is now doing that job. Besides coolant temp (194~214), ATF temp (188~208), battery/ECU voltage (14/13), there are many more sensors to choose from the app. I understand that not all of them are available for my specific car/connector. What are some other values that are useful to monitor and log? It's a 2017 CX-3 that didn't need extra attention until this year (after 153K+ miles). Thank you!
 

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