cmccabe commented on code in PR #19586:
URL: https://github.com/apache/kafka/pull/19586#discussion_r2076268224


##########
metadata/src/main/java/org/apache/kafka/controller/metrics/ControllerMetadataMetrics.java:
##########
@@ -39,10 +42,20 @@
  * {@link org.apache.kafka.controller.metrics.QuorumControllerMetrics}, not 
here.
  */
 public final class ControllerMetadataMetrics implements AutoCloseable {
+    public static final int BROKER_UNREGISTERED_STATE = -1;

Review Comment:
   Can you please create an Enum for the broker registration states? Also be 
sure to add an interface annotation "stable"



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