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<chapter id="work-with-usage">
  <title>Working with Usage</title>
  <para>The Usage Server is an optional, separately-installed part of &PRODUCT; that provides
    aggregated usage records which you can use to create billing integration for &PRODUCT;. 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. </para>
  <para>The usage records show the amount of resources, such as VM run time or template storage
    space, consumed by guest instances.</para>
  <para>The Usage Server runs at least once per day. It can be configured to run multiple times per
    day.</para>
  <xi:include href="configure-usage-server.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
  <xi:include href="set-usage-limit.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
  <xi:include href="globally-configured-limits.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
  <xi:include href="limit-accounts-domains.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</chapter>