apoorvmittal10 commented on code in PR #14933:
URL: https://github.com/apache/kafka/pull/14933#discussion_r1416635870


##########
core/src/test/scala/unit/kafka/server/KafkaApisTest.scala:
##########
@@ -6922,4 +6923,58 @@ class KafkaApisTest {
     val expectedResponse = new 
PushTelemetryResponseData().setErrorCode(Errors.INVALID_REQUEST.code)
     assertEquals(expectedResponse, response.data)
   }
+
+  @Test
+  def testListClientMetricsResourcesNotAllowedForZkClusters(): Unit = {
+    val request = buildRequest(new 
ListClientMetricsResourcesRequest.Builder(new 
ListClientMetricsResourcesRequestData()).build())
+    createKafkaApis(enableForwarding = true).handle(request, 
RequestLocal.NoCaching)
+
+    val response = 
verifyNoThrottling[ListClientMetricsResourcesResponse](request)
+    assertEquals(Errors.UNKNOWN_SERVER_ERROR, 
Errors.forCode(response.data.errorCode))

Review Comment:
   This test covers when KafkaApis is configured in ZK mode and gets rejected 
by common `handle` method which throws `new IllegalStateException` which 
translates to `UNKNOWN_SERVER_ERROR`.
   
   Then it also makes sense that no handling is needed in 
`handleListClientMetricsResources`, as method should always have 
`clientMetricsManager` if call reaches to that method. But I completed the 
request logically there if `clientMetricsManager` is None to avoid any error 
case.
   
   I have added a comment in the code as well.



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