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https://issues.apache.org/jira/browse/LOG4J2-2536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17453696#comment-17453696
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Ralph Goers commented on LOG4J2-2536:
-------------------------------------
It is recommended that all usages of the JsonLayout be migrated to
JsonTemplateLayout.
> <JsonLayout> -> <KeyValuePair> value is output as is
> ----------------------------------------------------
>
> Key: LOG4J2-2536
> URL: https://issues.apache.org/jira/browse/LOG4J2-2536
> Project: Log4j 2
> Issue Type: New Feature
> Components: Layouts
> Affects Versions: 2.11.1
> Reporter: liuzhongkai
> Priority: Major
>
> Use the function of the ${} placeholder in <KeyValuePair> value to output the
> relevant value when there is a value defined by ${} in the context. If not,
> it will be output as it is. In <PatternLayout> pattern, you can use %X{} to
> exist. If the output related value does not exist, it is an empty string.
> There is no such function in KeyValuePair.
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