Google Analytics 4 or Firebase Analytics is an analytics service that enables you to measure traffic and engagement across your websites and apps.
GA4 is a new kind of property with different reports and metrics calculation methods than what you're used to seeing in Universal Analytics properties.
We uses both Firebase and Google Analytics to power GA4 on our platform.
You can learn more on how to Setup your app for GA4, here.
To learn more about GA4, please refer the official Google Documentation here.