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https://issues.apache.org/jira/browse/LOG4J2-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15670843#comment-15670843
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Gary Gregory commented on LOG4J2-1694:
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We could also give the {{AbstractStringLayout}} an abstract builder and add a
{{KeyValuePair}} to it.
Then all {{AbstractStringLayout}} subclasses can use this new builder.
Gary
> Allow to easily add fields with fixed values to JSON output
> -----------------------------------------------------------
>
> Key: LOG4J2-1694
> URL: https://issues.apache.org/jira/browse/LOG4J2-1694
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Affects Versions: 2.7
> Reporter: Raimar Falke
> Labels: extra-field, json
>
> The Logback JSON Encoder has a feature which allows to specify JSON fields
> with fixed values. Link:
> https://github.com/logstash/logstash-logback-encoder#loggingevent_custom_global
> Example:
> {noformat}
> <encoder class="net.logstash.logback.encoder.LogstashEncoder">
>
> <customFields>{"appname":"myWebservice","roles":["customerorder","auth"],"buildinfo":{"version":"Version
>
> 0.1.0-SNAPSHOT","lastcommit":"75473700d5befa953c45f630c6d9105413c16fe1"}}</customFields>
> </encoder>
> {noformat}
> This is a very convenient way to specify fixed attributes like application,
> service or environment.
> So far I don't see such a possibility in log4j.
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