All Sites report
The All Sites report is a standard report that rolls up data from each of your sites. Use it to view and monitor key top-level metrics for all of your sites in one report.
The All Sites report can help you to monitor and compare performance across your sites. You can also apply report segments to better understand how specific types of visitors are using your websites.
The top row of the All Sites report shows the totals for the global client ID. Subsequent rows show how each site contributes to those totals.
You can choose between two different methods for reporting cross-site visitor and session activity in All Sites reports: Summed and Deduplicated. For more information, see Toggling between Summed and Deduplicated views of rollup reports.
The All Sites report does not count toward your maximum number of rollup reports.