junrao commented on code in PR #14767:
URL: https://github.com/apache/kafka/pull/14767#discussion_r1410140939


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -3697,16 +3698,60 @@ class KafkaApis(val requestChannel: RequestChannel,
     CompletableFuture.completedFuture[Unit](())
   }
 
-  // Just a place holder for now.
   def handleGetTelemetrySubscriptionsRequest(request: RequestChannel.Request): 
Unit = {
-    requestHelper.sendMaybeThrottle(request, 
request.body[GetTelemetrySubscriptionsRequest].getErrorResponse(Errors.UNSUPPORTED_VERSION.exception))
-    CompletableFuture.completedFuture[Unit](())
+    val subscriptionRequest = request.body[GetTelemetrySubscriptionsRequest]
+
+    if (ClientMetricsReceiverPlugin.instance.isEmpty) {
+      info("Received get telemetry client request, no metrics receiver plugin 
configured or running with ZK")
+      requestHelper.sendResponseMaybeThrottle(request, requestThrottleMs =>
+        subscriptionRequest.getErrorResponse(requestThrottleMs, 
Errors.UNSUPPORTED_VERSION.exception))

Review Comment:
   @apoorvmittal10 : ApiVersionResponse is defined to include all new types of 
requests supported on the server. So, there is no need to have a separate KIP. 
There is no need to add clientTelemetryEnabled in ApiVersionResponse. If 
clientTelemetryEnabled is false on the server, we can just exclude telemetry 
related API keys from ApiVersionResponse.



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