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https://issues.apache.org/jira/browse/LOG4J2-1015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14549836#comment-14549836
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Ralph Goers commented on LOG4J2-1015:
-------------------------------------

I believe I mentioned that when I proposed this. That is because $$\{marker} 
says to look for a property named "marker" while $$\{marker:} says to use the 
Marker Lookup and find a key with a null value.  The only other option I can 
think of would be to require something like $$\{marker:*}

> Add a way to route messages based on the %marker in Layout for RoutingAppender
> ------------------------------------------------------------------------------
>
>                 Key: LOG4J2-1015
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1015
>             Project: Log4j 2
>          Issue Type: New Feature
>          Components: Appenders
>    Affects Versions: 2.2
>            Reporter: Daniel Marcotte
>
> Hi,
> It seems there's no way to route messages based on the Marker in the 
> RoutingAppender. The "%marker" is not part of the Layout. When using SLF4J, 
> since it's a core feature of the facade, this would help greatly if it was 
> possible to route messages based on the Marker.
> Main StackOverFlow question (answered) : 
> http://stackoverflow.com/questions/30111754/log4j2-is-there-a-way-to-route-logs-based-on-marker-with-the-routingappender
> Workaround StackOverFlow question (answered) : 
> http://stackoverflow.com/questions/30247323/how-to-create-custom-rewritepolicy-in-log4j2
> Thank you



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