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https://issues.apache.org/jira/browse/LOG4J2-1010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15398682#comment-15398682
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Remko Popma commented on LOG4J2-1010:
-------------------------------------

As Mikael commented 
[here|https://issues.apache.org/jira/browse/LOG4J2-1447?focusedCommentId=15395488&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15395488],
 {{DynamicThresholdFilter}} filters on context data from the LogEvent once a 
log event has been created, and filters on context data from the ThreadContext 
directly if a LogEvent has not been created yet. I think what Mikael was trying 
to say was that with LOG4J2-1010, we can no longer assume that the 
ThreadContext is relevant for all LogEvents. Good point. It is not clear to me 
yet how DynamicThresholdFilter should be modified.

> Injectable context properties
> -----------------------------
>
>                 Key: LOG4J2-1010
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1010
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.2
>            Reporter: Mikael Ståldal
>            Assignee: Remko Popma
>             Fix For: 2.7
>
>         Attachments: properties.patch
>
>
> It would be useful to have a way to inject context properties into a 
> {{LogEvent}}, as an alternative to {{ThreadContext}}.
> In an asynchronous environment, using ThreadContext as currently implemented 
> is not so useful since JVM threads might not be coupled to the logical flow 
> of the application.



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