You need to link your Google AdSense account with Google Analytics for monitoring your website’s activity.
as for example, How many visitors are coming per day? Which device & network are they using? How many clicks you get from Google Adsense. And 1 more great facilities is your website will be verified by Google and Google search Engine.

if you want to know more – Watch this video
How to Link your Google AdSense account with Google Analytics

Thanks.