Billing provides the ability to collect usage statistics per instance, it may be useful for the customers with multiple servers (Cloud Instances). Collecting usage statistics per instance allows customers to receive an invoice that shows breakdown of costs by instance to get a better understanding how much each instance costs them.
To enable collecting usage statistics for selected service plan tick on the Attach Usage Statistics option. It can be done during service plan creation or when editing it.
Usage statistics information (if turned on) is available on respective tabs for Invoices and Orders; it can also be included into Notifications.