title: How do I Track App Uninstall / Remove Events for iOS using Firebase?
body: <p>I need to get monthly uninstall count for iOS using Firebase. I know that for Android, there's app_remove event that I can use even if it's not really accurate, but it's enough for now.
  From iTunesConnect or Playstore, they only give user retention data like how many user still use your app after x days, or daily uninstalls, which is not what i'm looking for.</p>