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https://issues.apache.org/jira/browse/LOG4J2-3583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17600590#comment-17600590
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ASF subversion and git services commented on LOG4J2-3583:
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Commit ccd807b00b4e748f7c1873cdbf30004457188ea2 in logging-log4j2's branch
refs/heads/dependabot/maven/spring-boot.version-2.7.3 from Piotr P. Karwasz
[ https://gitbox.apache.org/repos/asf?p=logging-log4j2.git;h=ccd807b00b ]
[LOG4J2-3583] Implements stack-valued MDC
This PR implements SLF4J-531 by storing the result of `pushByKey(key,
value)` in the usual thread context map and restoring the previous
value, when a `popByKey(key)` call occurs.
> Implement stack-valued MDC
> --------------------------
>
> Key: LOG4J2-3583
> URL: https://issues.apache.org/jira/browse/LOG4J2-3583
> Project: Log4j 2
> Issue Type: New Feature
> Components: SLF4J Bridge
> Reporter: Piotr Karwasz
> Assignee: Piotr Karwasz
> Priority: Minor
> Fix For: 2.19.0
>
>
> SLF4J 2.0 introduces a stack-valued MDC (cf.
> [SLF4J-531|https://jira.qos.ch/browse/SLF4J-531])), which must be implemented
> in the SLF4J to Log4j2 bridge.
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