Do I have to create custom definition for Firebase reserved parameters (Analytics)

Question

I'm using Firebase Analytics for My Android project. There I have a login functionality and I need to track it. So I've used the preserved event and parameter from Firebase. Link here.

firebaseAnalytics.logEvent(FirebaseAnalytics.Event.LOGIN) {
    param(FirebaseAnalytics.Param.METHOD, source)
}

As you see I'm using FirebaseAnalytics.Event and FirebaseAnalytics.Param. It's preserved in Firebase. As mentioned here : You don't need to set up custom dimensions and metrics for data collected through automatically collected events, enhanced measurement, and recommended events. So I didn't create a custom dimension for parameter FirebaseAnalytics.Param.METHOD, because the Login event is a recommended event.

But when I watch my login event in the firebase dashboard and go into details, I can't find the method parameter. I need to know which social media do users use mostly to login. But now I only see, how many login events happened. I can't see the source. So do I need to add the preserved parameters in custom dimensions as well?

Answer 1

Answer from the support team:

All the parameters you’ve associated with the event are custom events even if it is included in Firebase’s predefined parameter. The only difference is that Firebase’s predefined parameters have specific uses that maximize your event reports. So to conclude, though you are using FirebaseAnalytics.Param.METHOD which is listed in Firebase’s predefined parameters, you should still need to associate it with a custom definition in order for it to appear in your events report.