Volkan Yazici created LOG4J2-2962:
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Summary: Make "key" optional and add "flatten" to
JsonTemplateLayout "map" resolver
Key: LOG4J2-2962
URL: https://issues.apache.org/jira/browse/LOG4J2-2962
Project: Log4j 2
Issue Type: Improvement
Components: Layouts
Affects Versions: 2.14.0
Reporter: Volkan Yazici
As [reported by Magnus Kvalheim in a log4j2-logstash-layout
issue|https://github.com/vy/log4j2-logstash-layout/issues/68#issuecomment-726357901],
there is a request as follows:
bq. With the message resolver it's possible to set the {{fallbackKey}} - an
item to wishlist would be to be able to do the opposite. That is option to
disregard {{SimpleMessage}} (as it's already printed in the {{message}} field.)
Another option could be to use the mapresolver without specifying key?
If I understand the request right, making {{key}} directive optional (hence,
one would be able to resolve the entire {{MapMessage}}) and adding a
{{flatten}} directive (similar to the one in MDC resolver) can address this
wish. That is,
{code}
config = [ key ] , [ stringified ] , [ flatten ]
key = "key" -> string
stringified = "stringified" -> boolean
flatten = "flatten" -> ( boolean | flattenConfig )
flattenConfig = [ flattenPrefix ]
flattenPrefix = "prefix" -> string
{code}
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