Google new changes will simplify AdSense experiments and update the metrics that they currently offer. These changes will allow Google to provide you with more experiment types and more relevant metrics to help you make better-informed decisions.
Your Experiments page will reflect the following changes:
The New Google Adsense Changes
The Ad session length and RPM metrics
Google replaces the Ad session length and RPM metrics with a new metric called Revenue. Revenue reflects the total earnings outcome of your experiment changes and captures both RPM and session information in a single metric.
The Experiments report
Google removes the Experiments report from the Reports page. For the remaining experiment types, aggregate metrics will still be available in the experiment details page.