The Usage Server is an optional, separately-installed part of CloudStack that provides aggregated usage records which you can use to create billing integration for CloudStack. The Usage Server works by taking data from the events log and creating summary usage records that you can access using the listUsageRecords API call.

The usage records show the amount of resources, such as VM run time or template storage space, consumed by guest instances.

The Usage Server runs at least once per day. It can be configured to run multiple times per day.