mimaison commented on code in PR #12046:
URL: https://github.com/apache/kafka/pull/12046#discussion_r942490893


##########
server-common/src/main/java/org/apache/kafka/server/metrics/KafkaYammerMetrics.java:
##########
@@ -53,16 +72,21 @@ public static MetricsRegistry defaultRegistry() {
     }
 
     private final MetricsRegistry metricsRegistry = new MetricsRegistry();
-    private final FilteringJmxReporter jmxReporter = new 
FilteringJmxReporter(metricsRegistry,
-        metricName -> true);
+    private FilteringJmxReporter jmxReporter;
 
     private KafkaYammerMetrics() {
-        jmxReporter.start();

Review Comment:
   Looking at this further I'm not sure this is the best way to make this work. 
I wonder if we should apply the same treatment to `kafka.metrics.reporters` as 
we're doing to `metric.reporters`. The issue is that `FilteringJmxReporter` 
does not implement `KafkaMetricsReporter` but instead has its own API (based on 
Yammer's `JmxReporter`) so this would require quite a bit of changes.
   
   The other alternative is to not handle these Yammer reporters as the KIP 
only covered `JmxReporter` and `metric.reporters`.



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