Issue Type: New Feature New Feature
Assignee: Logback dev list
Components: logback-access
Created: 24/Sep/14 8:07 AM
Description:

As of version logback-access:1.1.2, there does not appear to be MDC support.

Example: 

    <pattern>%h %l %u [%t] "%r" %s %b "%i{Referer}" "%i{User-Agent}" %X{TRACER} %D</pattern>

%X is not a known pattern component, as shown in the resulting access log:

    %PARSER_ERROR[X]
Project: logback
Priority: Major Major
Reporter: Justin Posey
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