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https://issues.apache.org/jira/browse/LOG4J2-2062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188683#comment-16188683
]
ASF GitHub Bot commented on LOG4J2-2062:
----------------------------------------
Github user mikaelstaldal commented on the issue:
https://github.com/apache/logging-log4j2/pull/112
It would also be useful to enable interpolation with
[lookups](https://logging.apache.org/log4j/2.x/manual/lookups.html) for the
key, so that you could e.g. use some value from the thread context:
```
<Kafka name="Kafka" topic="log-test" key="$${ctx:key}">
```
See e.g.
[here](https://github.com/apache/logging-log4j2/blob/master/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/HttpURLConnectionManager.java#L95)
about how to do that.
> Add possibility of sending the key of a message to Kafka using KafkaAppender
> ----------------------------------------------------------------------------
>
> Key: LOG4J2-2062
> URL: https://issues.apache.org/jira/browse/LOG4J2-2062
> Project: Log4j 2
> Issue Type: Improvement
> Components: Appenders
> Affects Versions: 2.9.0
> Reporter: Jorge Sanchez
> Priority: Minor
>
> When using the KafkaAppender the KafkaManager only sends the value of a
> message to a Kafka topic.
> It could be useful to be able to assign a value to the key of that message
> via configuration instead of having it null.
> Check
> https://github.com/apache/logging-log4j2/blob/master/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/mom/kafka/KafkaManager.java#L99
> Updated with link to the PR: https://github.com/apache/logging-log4j2/pull/112
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