No Admob UserMetrics in Android

[PonyOny]

Describe the bug
I have a working integration on iOS and Android, I have observed that Admob UserMetrics are only working on iOS app, I suspect this is due to old "Google Mobile Ads SDK" for Android.

Admob documentation states:

Enabling user metrics will give you access to new data and powerful reports, such as the rewarded report, that may help inform your monetization strategy.
AdMob will begin reporting on sessions per user, session duration, ad exposure per session, daily active users (DAU), and more. Over time, as user metrics evolve, additional metrics and report types will become available.
To unlock these benefits, you’ll need to install the latest Google Mobile Ads SDK (18.1.0 or later for [Android](https://developers.google.com/admob/android/sdk), 7.44 or later for [iOS](https://developers.google.com/admob/ios/download)) and enable user metrics in the AdMob user interface.

To Reproduce
Steps to reproduce the behavior:

1. Go to AddMob dashboard and open Android App, UserMetrics are all empty

Expected behavior
Metrics should work with both iOS & Android, this probably needs a Google Mobile Ads SDK update for Android