C0urante commented on code in PR #14220:
URL: https://github.com/apache/kafka/pull/14220#discussion_r1295254068


##########
docs/upgrade.html:
##########
@@ -43,6 +43,10 @@ <h5><a id="upgrade_360_notable" 
href="#upgrade_360_notable">Notable changes in 3
             See <a 
href="https://cwiki.apache.org/confluence/display/KAFKA/KIP-925%3A+Rack+aware+task+assignment+in+Kafka+Streams";>KIP-925</a>
             and <a 
href="/{{version}}/documentation/streams/developer-guide/config-streams.html#rack-aware-assignment-strategy"><b>Kafka
 Streams Developer Guide</b></a> for more details.
         </li>
+        <li>To account for a break in compatibility introduced in version 
3.1.0, MirrorMaker 2 has added a new
+            <a 
href="#mirror_connector_replication.policy.internal.topic.separator.enabled">replication.policy.internal.topic.separator.enabled</a>
+            property. If upgrading from 3.0.x or earlier, it may be necessary 
to set this property to <code>false</code>; see the property's
+            <a 
href="#mirror_connector_replication.policy.internal.topic.separator.enabled">documentation</a>
 for more details.</li>

Review Comment:
   We can also link to 
[KIP-949](https://cwiki.apache.org/confluence/display/KAFKA/KIP-949%3A+Add+flag+to+enable+the+usage+of+topic+separator+in+MM2+DefaultReplicationPolicy)
 here, but I'm hoping that the information provided here and in the property's 
docstring should be sufficient to save people the time and effort of reading 
through an entire KIP instead.



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