Firebase User Engagement Calculation
问题 I am trying to wrap my head around the Firebase User Engagement Calculation. I am doing a lot of debugview testing now, and as the online documentation states (https://support.google.com/firebase/answer/6317485), Firebase is firing the user_engagement event by default on a periodic basis within a session while the app is in the foreground. What I have seen thusfar is that user_engagement is fired quite reliably in the beginning and end of an engagement (this can be occurring multiple times in