log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration packages="org.graylog2.log4j" shutdownHook="disable">
    <Appenders>
        <Console name="stdout" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX} %-5p [%c{1}] %m%n"/>
        </Console>

        <!-- Internal Graylog log appender. Please do not disable. This makes internal log messages available via REST calls. -->
        <Memory name="graylog-internal-logs" bufferSizeBytes="10MB">
            <PatternLayout pattern="%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX} %-5p [%c{1}] %m%n"/>
        </Memory>

    </Appenders>
    <Loggers>
        <!-- Application Loggers -->
        <Logger name="org.graylog" level="info"/>
        <Logger name="org.graylog2" level="info"/>
        <Logger name="org.graylog.datanode" level="info"/>
        <Logger name="com.github.joschi.jadconfig" level="warn"/>
        <!-- Disable messages from the version check -->
        <Logger name="org.graylog2.periodical.VersionCheckThread" level="off"/>
        <!-- Silence useless session validation messages -->
        <Logger name="org.apache.shiro.session.mgt.AbstractValidatingSessionManager" level="warn"/>
        <Root level="warn">
            <AppenderRef ref="stdout"/>
            <AppenderRef ref="graylog-internal-logs"/>
        </Root>
    </Loggers>
</Configuration>