Parallels Plesk Panel has a built-in mechanism that generates daily, weekly, or monthly reports on resource usage by customers, resellers, and domains. You can view these reports in Server Administration Panel > Tools & Utilities > Summary Report.
There are two types of report:
To switch between summary and full reports, choose the corresponding value in the checkbox at the top left of the screen.
You can also make Panel send these reports to a certain e-mail address. To do this, go to Server Administration Panel > Tools & Utilities > Summary Report > Delivery Schedule and choose the schedule from the existing ones or create a new one.
To produce reports, Panel uses the autoreport.php script located in $PRODUCT_ROOT_D/admin/plib/report/ directory, where $PRODUCT_ROOT_D is /usr/local/psa for RPM-based systems or /opt/psa on DEB-based systems.