advancedxy commented on code in PR #1991:
URL: 
https://github.com/apache/incubator-uniffle/pull/1991#discussion_r1705189992


##########
server/src/main/java/org/apache/uniffle/server/ShuffleServerMetrics.java:
##########
@@ -442,13 +438,7 @@ private static void setUpMetrics(ShuffleServerConf 
serverConf) {
     gaugeInFlushBufferSize = 
metricsManager.addLabeledGauge(IN_FLUSH_BUFFER_SIZE);
     gaugeUsedBufferSize = metricsManager.addLabeledGauge(USED_BUFFER_SIZE);
     gaugeReadBufferUsedSize = 
metricsManager.addLabeledGauge(READ_USED_BUFFER_SIZE);
-    gaugeUsedDirectMemorySize = 
metricsManager.addLabeledGauge(USED_DIRECT_MEMORY_SIZE);
-    gaugeUsedDirectMemorySizeByNetty =
-        metricsManager.addLabeledGauge(USED_DIRECT_MEMORY_SIZE_BY_NETTY);
-    gaugeUsedDirectMemorySizeByGrpcNetty =
-        metricsManager.addLabeledGauge(USED_DIRECT_MEMORY_SIZE_BY_GRPC_NETTY);
     gaugeWriteHandler = metricsManager.addLabeledGauge(TOTAL_WRITE_HANDLER);
-    gaugeEventQueueSize = metricsManager.addLabeledGauge(EVENT_QUEUE_SIZE);

Review Comment:
   I think it's necessary to add label as well.
   
   Did a look at the code, I think you should use 
`io.prometheus.client.dropwizard.DropwizardExports#DropwizardExports(com.codahale.metrics.MetricRegistry,
 io.prometheus.client.dropwizard.samplebuilder.SampleBuilder)` this method and 
passing a default labeled SampleBuilder. 



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