title: Distinguishing log entries in wildfly log
body: <p>I have such problem: I have several applications running on single wildfly. I want to distinguish (filter, count and so on) log entries somehow. 
  In applications I use slf4j.</p>
  
  <p>I've tried to set up MDC fields on application startup (from startup singleton), but wildfly doesn't log it. Is there any way to make MDC visible or any other way to distinguish applications?</p>
  
  <p>Btw, we're using SocketAppender with logstash and elasticsearch - maybe it's important.</p>
  
  <p>Thank you in advance.</p>