From this point on, you’ll be able to find AdSense in the Publisher section under Behavior. According to Google, the Ad Exchange integraton provides reporting for publishers who aren’t backfilling ad inventory with Ad Exchange through DoubleClick for Publishers (DFP).
There will be a new section for Ad Exchange Linking found under the Admin tab in Analytics to activate that integration.
the Google Analytics team said of the update:
“We hope that by consolidating these reports in the new Publisher Reporting section, it will help you better benefit from the intersection of ad serving, monetization and analytics data.”
The changes are going to be rolling out over the next few weeks.