jetty-server/src/main/config/etc/jetty-debuglog.xml

<?xml version="1.0"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN" "http://www.eclipse.org/jetty/configure_9_3.dtd">

<!-- =============================================================== -->
<!-- The DebugHandler                                                -->
<!-- =============================================================== -->

<Configure id="Server" class="org.eclipse.jetty.server.Server">
  <Get id="oldhandler" name="handler"/>
  <Set name="handler">
    <New id="DebugHandler" class="org.eclipse.jetty.server.handler.DebugHandler">
      <Set name="handler"><Ref refid="oldhandler"/></Set>
      <Set name="outputStream">
        <New class="org.eclipse.jetty.util.RolloverFileOutputStream">
          <Arg type="String"><Property name="jetty.debuglog.dir" deprecated="jetty.logs" default="./logs"/>/yyyy_mm_dd.debug.log</Arg>
          <Arg type="boolean"><Property name="jetty.debuglog.append" default="true"/></Arg>
          <Arg type="int"><Property name="jetty.debuglog.retainDays" default="90"/></Arg>
          <Arg>
            <Call class="java.util.TimeZone" name="getTimeZone"><Arg><Property name="jetty.debuglog.timezone" default="GMT"/></Arg></Call>
          </Arg>
        </New>
      </Set>
    </New>
  </Set>
</Configure>