I currently have the standard LogManager configuration that writes an access.log file for AEM.
The value of Message Pattern (org.apache.sling.commons.log.pattern) is "{5}". This logs the standard NCSA extended/combined log format.
Now I want to add custom fields, as described in:
Apache Sling :: Client Request Logging
However, I cannot add these format strings in the system console LogManager configuration like that. If I try it just stops working.
As I understand it, the "{5}" is just a placeholder for the default message being logged by the logger (which in this case is NCSA).
My org.apache.sling.engine.impl.log.RequestLogger is configured to an SLF4J logger.
The way I understand the section about MDC in Apache Sling :: Logging it sounds like it should be possible to pass through some custom log message format strings to the logger.
Now I tried
%d{dd.MM.yyyy HH:mm:ss.SSS} *%p* %h %l %u %t "%r" %>s %b "%\{Referer}i" "%\{User-Agent}i" "%\{Host}i"
But this does not work, logging stops in the access log when I try this.
Can someone point out the proper way to enter the access log format string in the Message Pattern field in the system console?
And no, I don't want to write my own logger in code - I prefer to just configure it and move on debugging (so please do not point out links to documentation of how to write my own custom loggers, I'm aware of those).
