Today Google announced:

It comes with new tools to help you develop faster, improve app quality, acquire and engage users, and monetize apps. The Firebase platform also comes with Firebase Analytics, a free and unlimited analytics solution for mobile apps.
Firebase Analytics is now Google’s recommended solution for mobile app analytics. It’s user and event-centric and comes with unlimited app event reporting, cross-network attribution, and postbacks. If you’re using Google Analytics for mobile app reporting today, you may want to consider adding Firebase and Firebase Analytics to your app to take advantage of some of its powerful new capabilities.

Here’s an overview.

And a showcase of marketing campaigns in Firebase.

Source: Analytics Blog: Introducing Firebase Analytics