Google Analytics accounts can be linked with the Game Center account so that traffic on individual Game Center pages can be monitored.
Enter your Game Center Manager https://webcast.wh.geniussports.com/ and go to Settings:
Enter a Google Analytics code into the relevant field-> Google Analytics Code.
Once your code has been entered please remember to Update your Game Center account settings to ensure the Analytics code is activated for Webcast tracking purposes.
Note. Google Analytics will start to collect data from activation day, it doesn't work for past.