ijuma commented on code in PR #18290:
URL: https://github.com/apache/kafka/pull/18290#discussion_r1894804402
##########
docs/upgrade.html:
##########
@@ -227,6 +227,11 @@ <h5><a id="upgrade_400_notable"
href="#upgrade_400_notable">Notable changes in 4
Java 8 support has been removed in Apache Kafka 4.0
See <a
href="https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=181308223";>KIP-750</a>
for more details
</li>
+ <li>
+ Logging framework has been migrated from Log4j to Log4j2.
Review Comment:
Do we want to automatically detect if log4j 1.x properties are used and, if
so, automatically enable this mode? It seems like a huge problem if customers
lose their logging while upgrading to 4.0+.
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