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https://issues.apache.org/jira/browse/LOG4J2-16?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12607140#action_12607140
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Curt Arnold commented on LOG4J2-16:
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I think that this can fit into the "context" concept which is an open ended
place for either explicitly supplied context (like markers would seem to be) or
implicit context (such as thread name, MDC and NDC content, user) that are
collected from the environment.
Not sure how well I described that in the pattern-layout code.
> Provide support for SLF4J type Markers
> --------------------------------------
>
> Key: LOG4J2-16
> URL: https://issues.apache.org/jira/browse/LOG4J2-16
> Project: Log4j 2
> Issue Type: New Feature
> Components: Core
> Reporter: Ralph Goers
>
> We wrote our own logging framework primarily because log4j didn't provide
> some of the features we needed. One feature was more granularity, especially
> around logging. We encourage entry and exit tracing, logging of input and
> output data, logging of elapsed time statistics and several other flavors if
> "debug" information. Turning all this on in production generates too much
> data. Our framework supported the concept of Log Type in addition to Log
> Level. When filtering there was a LogType array where each array element was
> the log level. The LogRecord contained the LogType and LogLevel so doing
> filtering was very fast.
> SLF4J supports Markers. These can essentially be used for the same purpose
> (assuming another Jira issue regarding filtering is implemented). Markers are
> much more flexible since they can be arbitrarily created. Loggers should then
> be able to filter on whether a marker is present in addition to the LogLevel.
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