Just thought I'd share an awesome app I've discovered lately for Android for system info and logging, called "Diagnosis - System Information". It's developed by Darken, the same guys that made "SD Maid", which I also swear by.

 

It gives me visibility of CPU use and speed, memory, active apps, battery voltage and temp, network traffic even isolating down to MBB usage/second. It can log data for up to a week at a time, and you can set to gather data as frequent as 1 second for primo accuracy.

You can see in the first line up the top left of my screenshot, Ive setup real time CPU freq (all cores, although I can isolate to single cores) CPU usage with isolated values for user and system, and cell traffic which should be 0 while I'm on WiFi. Second line is apps in use, memory and real free memory, with apps using >40% and 70% CPU set up to show to isolate drainy apps. 

To the top right, I've got battery voltage and temp under the stock battery percentage icon and then the date and time und the stock time because I can.

It's pretty awesome, and I'm sure with some work I can get some of these values reporting to my Pebble watch too.

 


Diagnosis: https://play.google.com/store/apps/details?id=eu.thedarken.diagnosis

 

SD Maid: https://play.google.com/store/apps/details?id=eu.thedarken.sdm