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https://issues.apache.org/jira/browse/LOG4J2-2831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092908#comment-17092908
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Horacio Mijail Anton Quiles commented on LOG4J2-2831:
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I never looked at Plugins because I never knew I should do so even while using
vanilla log4j2.
So, rephrasing the initial question: is there a definite place where it is
called out whether an Appender or anything else supports runtime substitution,
as
[https://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution]
says?
> Documentation doesn't list all the Appenders that can do runtime lookup
> -----------------------------------------------------------------------
>
> Key: LOG4J2-2831
> URL: https://issues.apache.org/jira/browse/LOG4J2-2831
> Project: Log4j 2
> Issue Type: Improvement
> Components: Documentation
> Reporter: Horacio Mijail Anton Quiles
> Priority: Major
>
> The Appenders documentation page doesn't seem to mention all the cases in
> which lookups/property substitution are applied at runtime.
> For example, the Routing Appender evidently does runtime substitution, as
> mentioned in
> [https://logging.apache.org/log4j/2.x/manual/configuration.html#PropertySubstitution]
> . This page also says "Not all elements support resolving variables at
> runtime. Components that do will specifically call that out in their
> documentation. "
> However this is not called out in
> [https://logging.apache.org/log4j/2.x/manual/appenders.html#RoutingAppender]
> If "their documentation" means some other page, it'd be good to link to it.
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