philipnee commented on code in PR #14724: URL: https://github.com/apache/kafka/pull/14724#discussion_r1411305972
########## clients/src/main/java/org/apache/kafka/clients/ClientTelemetryProvider.java: ########## @@ -0,0 +1,144 @@ +/* + * 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.clients; + +import io.opentelemetry.proto.common.v1.AnyValue; +import io.opentelemetry.proto.common.v1.KeyValue; +import io.opentelemetry.proto.resource.v1.Resource; + +import org.apache.kafka.clients.consumer.ConsumerConfig; +import org.apache.kafka.clients.producer.ProducerConfig; +import org.apache.kafka.common.Configurable; +import org.apache.kafka.common.metrics.MetricsContext; +import org.apache.kafka.common.telemetry.internals.ClientTelemetryUtils; + +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +public class ClientTelemetryProvider implements Configurable { + + public static final String DOMAIN = "org.apache.kafka"; + // Client metrics tags + public static final String CLIENT_RACK = "client_rack"; + public static final String GROUP_ID = "group_id"; + public static final String GROUP_INSTANCE_ID = "group_instance_id"; + public static final String GROUP_MEMBER_ID = "group_member_id"; + public static final String TRANSACTIONAL_ID = "transactional_id"; + + private static final String PRODUCER_NAMESPACE = "kafka.producer"; + private static final String CONSUMER_NAMESPACE = "kafka.consumer"; + + private static final Map<String, String> PRODUCER_CONFIG_MAPPING = new HashMap<>(); + private static final Map<String, String> CONSUMER_CONFIG_MAPPING = new HashMap<>(); + + private volatile Resource resource = null; + private Map<String, ?> config = null; + + // Mapping of config keys to telemetry keys. Contains only keys which can be fetched from config. + // Config like group_member_id is not present here as it is not fetched from config. + static { + PRODUCER_CONFIG_MAPPING.put(ProducerConfig.TRANSACTIONAL_ID_CONFIG, ClientTelemetryProvider.TRANSACTIONAL_ID); + + CONSUMER_CONFIG_MAPPING.put(ConsumerConfig.GROUP_ID_CONFIG, ClientTelemetryProvider.GROUP_ID); + CONSUMER_CONFIG_MAPPING.put(ConsumerConfig.GROUP_INSTANCE_ID_CONFIG, ClientTelemetryProvider.GROUP_INSTANCE_ID); + } + + @Override + public synchronized void configure(Map<String, ?> configs) { + this.config = configs; + } + + /** + * Validate that all the data required for generating correct metrics is present. + * + * @param metricsContext {@link MetricsContext} + * @return false if all the data required for generating correct metrics is missing, true + * otherwise. + */ + public boolean validate(MetricsContext metricsContext) { + return ClientTelemetryUtils.validateRequiredResourceLabels(metricsContext.contextLabels()); + } + + /** + * Sets the metrics tags for the service or library exposing metrics. This will be called before + * {@link org.apache.kafka.common.metrics.MetricsReporter#init(List)} and may be called anytime + * after that. + * + * @param metricsContext {@link MetricsContext} + */ + public synchronized void contextChange(MetricsContext metricsContext) { + final Resource.Builder resourceBuilder = Resource.newBuilder(); + + final String namespace = metricsContext.contextLabels().get(MetricsContext.NAMESPACE); + if (PRODUCER_NAMESPACE.equals(namespace)) { + // Add producer resource labels. + PRODUCER_CONFIG_MAPPING.forEach((configKey, telemetryKey) -> { + if (config.containsKey(configKey)) { + addAttribute(resourceBuilder, telemetryKey, String.valueOf(config.get(configKey))); + } + }); + } else if (CONSUMER_NAMESPACE.equals(namespace)) { + // Add consumer resource labels. + CONSUMER_CONFIG_MAPPING.forEach((configKey, telemetryKey) -> { + if (config.containsKey(configKey)) { + addAttribute(resourceBuilder, telemetryKey, String.valueOf(config.get(configKey))); + } + }); + } + + // Add client rack label. + if (config.containsKey(CommonClientConfigs.CLIENT_RACK_CONFIG)) { + addAttribute(resourceBuilder, CLIENT_RACK, String.valueOf(config.get(CommonClientConfigs.CLIENT_RACK_CONFIG))); + } + + resource = resourceBuilder.build(); + } + + public synchronized void updateLabels(Map<String, String> labels) { Review Comment: i wonder if we should be more consistent with documenting all public methods. -- This is an automated message from the Apache Git Service. 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