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https://issues.apache.org/jira/browse/LOG4J2-1694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15988928#comment-15988928
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ASF subversion and git services commented on LOG4J2-1694:
---------------------------------------------------------

Commit b2e2d06d23cc6c5d1e5da7857f9b2cd52e95ab5e in logging-log4j2's branch 
refs/heads/master from [~mikaelstaldal]
[ https://git-wip-us.apache.org/repos/asf?p=logging-log4j2.git;h=b2e2d06 ]

LOG4J2-1694 Add builds to XmlLayout and YamlLayout, add additionalFields 
property to JsonLayout, XmlLayout and YamlLayout (currently no-op, W.I.P.)


> 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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