I'm working with Firebase analytics and I'm trying to figure out the best way to track the engagement of our (iOS app) users. I see that there are multiple events and properties related to engagement, such as the "user_engagement" event (and the "engagement_time_msec" property) and "ga_session". User engagement seems a bit too low-level/frequent. It basically happens any time the user touches the screen and after booting the app I see that it is often sent 2/3 times ever before interacting with the app itself. While trying to find a better solution I stumbled across another event property, which is called "session_start" and sometimes it comes with a property called "session_engaged". It appears to be a bool or a counter (it's always 1 as far as I saw). I could not find any documentation on this event and property.
Anybody who can give me more info on that? Thanks!
session_start is when a user engages the app for more than the minimum session duration after a period of inactivity that exceeds the session timeout duration.
https://support.google.com/firebase/answer/6317485?hl=en&ref_topic=6317484