soarez commented on code in PR #15718:
URL: https://github.com/apache/kafka/pull/15718#discussion_r1567417492


##########
docs/ops.html:
##########
@@ -2113,6 +2113,22 @@ <h5 class="anchor-heading"><a 
id="kraft_controller_monitoring" class="anchor-lin
     <td>The number of active brokers as observed by this Controller.</td>
     <td>kafka.controller:type=KafkaController,name=ActiveBrokerCount</td>
   </tr>
+  <tr>
+    <td>Migrating ZK Broker Count</td>
+    <td>The number of brokers registered with the Controller that haven't yet 
migrated to KRaft mode.</td>
+    <td>kafka.controller:type=KafkaController,name=MigratingZkBrokerCount</td>
+  </tr>
+  <tr>
+    <td>ZK Migrating State</td>
+    <td>
+      0 - NONE, cluster created in KRaft mode;
+      4 - ZK, Migration has not started, controller is a ZK controller.
+      2 - PRE_MIGRATION, the KRaft Controller is waiting for all ZK brokers to 
register in migration mode;
+      1 - MIGRATION, ZK metadata has been migrated, but some broker is still 
running in ZK mode;
+      3 - POST_MIGRATION, the cluster migration is complete;

Review Comment:
   Well spotted, that was unintended. Updated



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