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https://issues.apache.org/jira/browse/LOG4J2-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13597247#comment-13597247
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Scott Severtson commented on LOG4J2-168:
----------------------------------------

I'm finally digging back into this, and I'm a bit confused - not sure that I 
fully understand the configuration initialization process, or how to wire 
things together.

I've created a MDCFields plugin, with the following factory method:
    @PluginFactory
    public static ConcurrentMap<String, String> createKeyValuePairsMap(
                                             @PluginElement("MDCFields") final 
KeyValuePair[] keyValuePairs)

However, in RFC5424Layout, which of the following do I include in the 
.createLayout(...) factory method?
1. @PluginElement("mdcFields") MDCFields mdcFields,
2. @PluginElement("mdcFields") Map<String, String> mdcFields,

Also, the AppendersPlugin returns a ConcurrentMap - is this necessary for the 
MDCFields plugin? I didn't think the configuration could be modified except by 
a complete reload, so I'm not sure why a ConcurrentMap is needed versus a 
plain-old Map.

Thanks!
                
> Include arbitrary message fields in RFC-5424 structured data
> ------------------------------------------------------------
>
>                 Key: LOG4J2-168
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-168
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Layouts
>    Affects Versions: 2.0-beta5
>         Environment: N/A
>            Reporter: Scott Severtson
>            Priority: Minor
>         Attachments: include-arbitrary-fields-in-mdc.patch
>
>
> We'd really like to see the logger and/or location be included in RFC-5424 
> structured data. As such, we've developed a small patch to allow arbitrary 
> PatternLayout names to be configured on the SyslogAppender, which are then 
> included in the structured data.
> Patch to follow shortly.

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