li4wang commented on a change in pull request #1644:
URL: https://github.com/apache/zookeeper/pull/1644#discussion_r598217478



##########
File path: 
zookeeper-server/src/main/java/org/apache/zookeeper/server/ServerMetrics.java
##########
@@ -259,6 +260,8 @@ private ServerMetrics(MetricsProvider metricsProvider) {
         WATCH_BYTES = metricsContext.getCounter("watch_bytes");
 
         JVM_PAUSE_TIME = metricsContext.getSummary("jvm_pause_time_ms", 
DetailLevel.ADVANCED);
+
+        QUOTA_EXCEEDED_ERROR_PER_NAMESPACE = 
metricsContext.getSummarySet(QuotaMetricsUtils.QUOTA_EXCEEDED_ERROR_PER_NAMESPACE,
 DetailLevel.BASIC);

Review comment:
       SummarySet is used because it provides count (i.e. cnt) and the grouping 
capability.  Yes, you are right, in this case, since the count is always added 
by 1, the cnt and sum are the same with PrometheusMetricsProvider  and the 
min/max/avg with DefaultMetricsProvider are always 1 in this case. 
   
   Is there any reason that CounterSet is not supported?
   
   I added GaugeSet for other quota metrics, as SummarySet can not be used.
   
   
   




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