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<configuration>
  <turboFilter class="ch.qos.logback.classic.turbo.MDCFilter">
    <MDCKey>user</MDCKey>
    <Value>JDoe</Value>
    <OnMatch>ACCEPT</OnMatch>
    <onMismatch>DENY</onMismatch>
  </turboFilter>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>user=%X{user} %msg %n</pattern>
    </encoder>
  </appender>

 <root level="debug">
   <appender-ref ref="STDOUT" />
 </root>
</configuration>