Carter Kozak closed LOG4J2-2318.

> AsyncQueueFullMessageUtil causes unparsable message output
> ----------------------------------------------------------
>                 Key: LOG4J2-2318
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2318
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.11.0
>            Reporter: Carter Kozak
>            Assignee: Carter Kozak
>            Priority: Major
>             Fix For: 3.0.0
> AsyncQueueFullMessageUtil.transform modifies message format, dropping message 
> format and parameters, and concatenates text to the formatted output.
> It's a fairly common workflow to write a message implementation which outputs 
> json or some other structured data (e.g. request logs) which are parsed by 
> another mechanism. This often uses PatternLayout with pattern "%m%n". The 
> current implementation of AsyncQueueFullMessageUtil concatenates a warning to 
> the formatted message, which can break parsers.
> Proposal: Avoid modifying the message itself in favor of using 
> StatusLogger.warn when messages may be logged out of order.

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