I have been using the "Get Label" API to get the details of a particular Label.
It was all working until the last couple of days.
What I now observe is that the "Total Messages" Count is always 0. "UnRead Messages" Count show up properly.
I have used it in my application and also tried it from https://developers.google.com/gmail/api/v1/reference/users/labels/get - "Try It Now" and the result is the same --- 0 Total Messages