How to know if the requests to GCM have stopped?

[raghuugare]

Recently, we got a 'notification' from Google saying that we need to migrate to FCM from GCM as soon as possible and that one of our Firebase projects was still using GCM end-points. (The deadline is May 29, 2019 when GCM systems are to be deprecated).

They also mentioned that our project on Firebase console, is still sending many requests to GCM.

Upon investigating, we found that we were indeed using an old gcm Python package which naturally sent PUSH notifications via GCM server endpoints.

So, we upgraded the code to use a new, equivalent fcm package & pushed to prod.

Now, how to know if the requests to GCM have completely stopped (as is our expectation)??

Is there someone in Google we can/should contact for confirming this?

(Note: since the tokens are meant to be compatible, our Push notifications flow is working all fine via the new FCM end-points. We just want to confirm that we are done with this change before the deadline of May-29, 2019.)

Any help please...?