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https://issues.apache.org/jira/browse/LOG4J2-1074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14614311#comment-14614311
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Ralph Goers commented on LOG4J2-1074:
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Can you measure the overhead of calling System.nanoTime() on each event. It
would be nice to document that in the case where a user enables it. My guess is
that it will still be inconsequential compared to the I/O overhead, but it is
still nice to know.
> Add a logformat token for nanotime
> ----------------------------------
>
> Key: LOG4J2-1074
> URL: https://issues.apache.org/jira/browse/LOG4J2-1074
> Project: Log4j 2
> Issue Type: New Feature
> Reporter: Will Hains
>
> Add a token in the log format specifier to output the current value of
> {{System.nanotime()}}.
> We are currently adding the nanotime value to our log messages manually,
> which we find very useful for troubleshooting unexpected latency, and as a
> quick-and-dirty data source to feed into performance analysis tools.
> It would be very nice if Log4j could do this for us. It would also be nice to
> have this in the log format specified, so we can turn it on/off at runtime by
> editing the Log4j config file.
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