Carter Kozak created LOG4J2-2352:

             Summary: Reusable event message mementos should be cached
                 Key: LOG4J2-2352
             Project: Log4j 2
          Issue Type: Improvement
          Components: Core
            Reporter: Carter Kozak

When multiple AsyncAppenders are configured, we invoke MutableLogEvent.memento 
(or RingBufferLogEvent.memento) for each one, allocating multiple formatted 

On the first invocation, we can set the event message to the new MementoMessage 
to avoid re-allocations.

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