kevin-wu24 commented on code in PR #18304:
URL: https://github.com/apache/kafka/pull/18304#discussion_r1935932934


##########
raft/src/main/java/org/apache/kafka/raft/internals/KafkaRaftMetrics.java:
##########
@@ -137,6 +99,14 @@ public KafkaRaftMetrics(Metrics metrics, String 
metricGrpPrefix, QuorumState sta
                 "Number of unknown voters whose connection information is not 
cached; would never be larger than quorum-size.");
         metrics.addMetric(this.numUnknownVoterConnectionsMetricName, (mConfig, 
currentTimeMs) -> numUnknownVoterConnections);
 
+        this.numVotersMetricName = metrics.metricName("number-of-voters", 
metricGroupName, "Number of voters for a KRaft topic partition.");
+        metrics.addMetric(this.numVotersMetricName, (Gauge<Integer>) (mConfig, 
currentTimestamp) -> numVoters);

Review Comment:
   Link to jira: https://issues.apache.org/jira/browse/KAFKA-18679



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