mjsax commented on code in PR #17021:
URL: https://github.com/apache/kafka/pull/17021#discussion_r1828305812


##########
streams/integration-tests/src/test/java/org/apache/kafka/streams/integration/KafkaStreamsTelemetryIntegrationTest.java:
##########
@@ -0,0 +1,506 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.kafka.streams.integration;
+
+import org.apache.kafka.clients.admin.Admin;
+import org.apache.kafka.clients.admin.AdminClientConfig;
+import org.apache.kafka.clients.consumer.Consumer;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.KafkaConsumer;
+import org.apache.kafka.clients.producer.KafkaProducer;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.common.Metric;
+import org.apache.kafka.common.MetricName;
+import org.apache.kafka.common.Uuid;
+import org.apache.kafka.common.metrics.KafkaMetric;
+import org.apache.kafka.common.metrics.MetricsReporter;
+import org.apache.kafka.common.serialization.ByteArrayDeserializer;
+import org.apache.kafka.common.serialization.ByteArraySerializer;
+import org.apache.kafka.common.serialization.Deserializer;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.server.authorizer.AuthorizableRequestContext;
+import org.apache.kafka.server.telemetry.ClientTelemetry;
+import org.apache.kafka.server.telemetry.ClientTelemetryPayload;
+import org.apache.kafka.server.telemetry.ClientTelemetryReceiver;
+import org.apache.kafka.shaded.io.opentelemetry.proto.metrics.v1.MetricsData;
+import org.apache.kafka.streams.ClientInstanceIds;
+import org.apache.kafka.streams.KafkaClientSupplier;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.Topology;
+import org.apache.kafka.streams.integration.utils.EmbeddedKafkaCluster;
+import org.apache.kafka.streams.integration.utils.IntegrationTestUtils;
+import org.apache.kafka.streams.kstream.Consumed;
+import org.apache.kafka.streams.kstream.Produced;
+import org.apache.kafka.test.TestUtils;
+import org.apache.kafka.tools.ClientMetricsCommand;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+import org.junit.jupiter.api.Timeout;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Properties;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import static org.apache.kafka.common.utils.Utils.mkEntry;
+import static org.apache.kafka.common.utils.Utils.mkMap;
+import static org.apache.kafka.common.utils.Utils.mkObjectProperties;
+import static org.apache.kafka.streams.utils.TestUtils.safeUniqueTestName;
+import static org.apache.kafka.test.TestUtils.waitForCondition;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@Timeout(600)
+@Tag("integration")
+public class KafkaStreamsTelemetryIntegrationTest {
+    private String appId;
+    private String inputTopicTwoPartitions;
+    private String outputTopicTwoPartitions;
+    private String inputTopicOnePartition;
+    private String outputTopicOnePartition;
+    private Properties streamsApplicationProperties = new Properties();
+    private Properties streamsSecondApplicationProperties = new Properties();
+
+    private static EmbeddedKafkaCluster cluster;
+    private static final List<MetricsInterceptingConsumer<byte[], byte[]>> 
INTERCEPTING_CONSUMERS = new ArrayList<>();
+    private static final List<TestingMetricsInterceptingAdminClient> 
INTERCEPTING_ADMIN_CLIENTS = new ArrayList<>();
+    private static final int NUM_BROKERS = 3;
+    private static final int FIRST_INSTANCE_CONSUMER = 0;
+    private static final int SECOND_INSTANCE_CONSUMER = 1;
+    private static final Logger LOG = 
LoggerFactory.getLogger(KafkaStreamsTelemetryIntegrationTest.class);
+
+
+    @BeforeAll
+    public static void startCluster() throws IOException {
+        final Properties properties = new Properties();
+        properties.put("metric.reporters", TelemetryPlugin.class.getName());
+        cluster = new EmbeddedKafkaCluster(NUM_BROKERS, properties);
+        cluster.start();
+    }
+
+    @BeforeEach
+    public void setUp(final TestInfo testInfo) throws InterruptedException {
+        appId = safeUniqueTestName(testInfo);
+        inputTopicTwoPartitions = appId + "-input-two";
+        outputTopicTwoPartitions = appId + "-output-two";
+        inputTopicOnePartition = appId + "-input-one";
+        outputTopicOnePartition = appId + "-output-one";
+        cluster.createTopic(inputTopicTwoPartitions, 2, 1);
+        cluster.createTopic(outputTopicTwoPartitions, 2, 1);
+        cluster.createTopic(inputTopicOnePartition, 1, 1);
+        cluster.createTopic(outputTopicOnePartition, 1, 1);
+    }
+
+    @AfterAll
+    public static void closeCluster() {
+        cluster.stop();
+    }
+
+    @AfterEach
+    public void tearDown() throws Exception {
+        INTERCEPTING_CONSUMERS.clear();
+        INTERCEPTING_ADMIN_CLIENTS.clear();
+        
IntegrationTestUtils.purgeLocalStreamsState(streamsApplicationProperties);
+        if (!streamsSecondApplicationProperties.isEmpty()) {
+            
IntegrationTestUtils.purgeLocalStreamsState(streamsSecondApplicationProperties);
+        }
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"INFO", "DEBUG", "TRACE"})
+    @DisplayName("End-to-end test validating metrics pushed to broker")
+    public void shouldPushMetricsToBroker(final String recordingLevel) throws 
Exception {
+        streamsApplicationProperties  = props(true);
+        
streamsApplicationProperties.put(StreamsConfig.METRICS_RECORDING_LEVEL_CONFIG, 
recordingLevel);
+        final Topology topology = simpleTopology();
+        subscribeForStreamsMetrics();
+        try (final KafkaStreams streams = new KafkaStreams(topology, 
streamsApplicationProperties)) {
+            IntegrationTestUtils.startApplicationAndWaitUntilRunning(streams);
+            final ClientInstanceIds clientInstanceIds = 
streams.clientInstanceIds(Duration.ofSeconds(60));
+            final Uuid adminInstanceId = clientInstanceIds.adminInstanceId();
+            
+            final Uuid mainConsumerInstanceId = 
clientInstanceIds.consumerInstanceIds().entrySet().stream()
+                    .filter(entry -> 
!entry.getKey().endsWith("-restore-consumer")
+                            && !entry.getKey().endsWith("GlobalStreamThread"))
+                    .map(Map.Entry::getValue)
+                    .findFirst().orElseThrow();
+            assertNotNull(adminInstanceId);
+            assertNotNull(mainConsumerInstanceId);
+            LOG.info("Main consumer instance id {}", mainConsumerInstanceId);
+
+            TestUtils.waitForCondition(() -> 
!TelemetryPlugin.SUBSCRIBED_METRICS.get(mainConsumerInstanceId).isEmpty(),
+                    30_000,
+                    "Never received subscribed metrics");
+            final List<String> expectedMetrics = 
streams.metrics().values().stream().map(Metric::metricName)
+                    .filter(metricName -> 
metricName.tags().containsKey("thread-id")).map(mn -> {
+                        final String name = mn.name().replace('-', '.');
+                        final String group = mn.group().replace("-metrics", 
"").replace('-', '.');
+                        return "org.apache.kafka." + group + "." + name;
+                    }).sorted().collect(Collectors.toList());
+            final List<String> actualTaskMetrics = new 
ArrayList<>(TelemetryPlugin.SUBSCRIBED_METRICS.get(mainConsumerInstanceId));

Review Comment:
   Why is this "actual task metrics"? Won't we get the plain consumer metrics 
back here too (if not, why)?
   
   And why "task" metrics?



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