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https://issues.apache.org/jira/browse/LOG4J2-1401?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15307715#comment-15307715
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Mikael Ståldal commented on LOG4J2-1401:
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If you are going to work on ThreadContext, please take
https://issues.apache.org/jira/browse/LOG4J2-1010 into consideration.
> Support changing the log level for all messages related to some domain object
> -----------------------------------------------------------------------------
>
> Key: LOG4J2-1401
> URL: https://issues.apache.org/jira/browse/LOG4J2-1401
> Project: Log4j 2
> Issue Type: New Feature
> Components: Core, Filters
> Affects Versions: 2.6
> Reporter: Remko Popma
>
> During system operations, it is commonly desirable to temporarily make
> logging for a certain domain object more verbose. For example, all log
> messages related to processing a certain order, or for a certain user, or for
> a certain product.
> In addition to manually increasing/decreasing verbosity, it would be nice if
> we can restore the original verbosity if some condition no longer holds. For
> example, log at some verbose level
> * for some period of time (5 minutes)
> * for some fixed number of events (10,000 log messages)
> * any other user-specified condition
> *How to identify which log messages to log at more verbose level*
> * Marker
> * ThreadContext map
> * Other?
> Markers are cached forever, which may not be desirable if we need to tag
> every log message with the order ID, user ID and/or product ID.
> ThreadContext is a good option since values can be replaced and/or cleared so
> we don't use up increasingly more memory. The drawback of the ThreadContext
> API is that values must be Strings.
> We would like the ability to specify arbitrary Object values, or even
> primitive values. Also, ideally this should be garbage-free (LOG4J2-1349).
> *Considerations for a new or extended ThreadContext*
> * Adding or setting values: what should the user-facing API look like?
> * Merging the snapshot of the current ThreadContext map with the
> Configuration Properties into the LogEvent map
> * Getting values out of the LogEvent for use by Filters and/or Layouts. This
> may be by a specified key or by iterating over the keys.
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