Figuring out what's using your phone's battery life is helpful in figuring out how to make it last longer. Now, in Android M, you can see when your camera or flashlight was in use.
The battery stats in Android have long shown things like cellular network signal, GPS, Wi-Fi and screen on time. Now, with the newest update, you can also see when your phone was using the camera or flashlight as well. Since these things can also be huge battery drains, this should help diagnose any serious power drains.