java-chassis-samples/metrics-write-file-sample/metrics-write-file/src/main/resources/sample-logback.xml

<?xml version="1.0" encoding="UTF-8"?>
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<configuration scan="true">
  <jmxConfigurator/>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d [%level] [%thread] - %msg (%F:%L\)%n</pattern>
    </encoder>
  </appender>

  <root level="INFO">
    <appender-ref ref="STDOUT"/>
  </root>

  <appender name="cloudEyeAppender" class="ch.qos.logback.classic.sift.SiftingAppender">
    <!--   This is MDC value -->
    <discriminator>
      <key>fileName</key>
      <defaultValue>unknown</defaultValue>
    </discriminator>

    <sift>
      <appender name="cloudEyeAppender-${fileName}" class="ch.qos.logback.core.FileAppender">
        <file>${cloudEye.logDir}/${fileName}</file>
        <append>true</append>
        <layout class="ch.qos.logback.classic.PatternLayout">
          <pattern>%msg%n</pattern>
        </layout>
      </appender>
    </sift>
  </appender>

  <logger name="cloudEyeLogger" level="info" additivity="false">
    <appender-ref ref="cloudEyeAppender"/>
  </logger>
</configuration>