Does android somehow keep track of which apps are/were ruing and if so when it was in foreground or background, etc?
I already had a look at adb logcat, which gives a rather overwhelming amount of data and I'm not quite sure if I actually will be able to deduce what was started when, but that might be possible.
Seeing how that log disappears after a while and does not survive reboots, I was curious if I'm maybe there might other places where android keeps information about ruing apps. For instance a colleague mentioned that iOS ruing apps can usually be deduced from the automatic screenshots it takes for app switching.