Spring boot 2.3.4 - Kafka 指标在 /actuator/prometheus 中不可见

Question

我有一个 Spring Boot 应用程序（版本 2.3.4），我正在使用 @KafkaListener 来消费记录。我还使用执行器和千分尺（1.5.5 版）作为指标。

问题是我在 /actuator/prometheus 中看不到 Kafka 指标。 我正在使用以下依赖项：

'org.springframework.boot' version '2.3.4.RELEASE'
implementation group: 'org.springframework.kafka', name: 'spring-kafka', version: '2.5.10.RELEASE'
implementation group: 'org.apache.kafka', name: 'kafka-clients', version: '2.5.1'

并将这些属性添加到 application.yaml：

management:
  server:
    port: 9091
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      probes:
        enabled: true

spring:
  jmx:
    enabled: true

如果我应该添加任何其他内容以使 kafka 指标在 /actuator/prometheus 中可见，请尝试失败

请注意，当我使用默认 KafkaTemplate 时，这些指标是可见的，但在尝试创建自定义 KafkaTemplate 时，指标会消失：

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    public ProducerFactory<String, String> customProducerFactory() {
        Map<String, Object> configProps = new HashMap<>();
        configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");
        configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, Serdes.String().serializer().getClass().getName());
        configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, Serdes.String().serializer().getClass().getName());
        return new DefaultKafkaProducerFactory<>(configProps);
    }

    @Bean
    public KafkaTemplate<String, String> customProducer() {
        return new KafkaTemplate<>(customProducerFactory());
    }

    @KafkaListener(id = "test", topics = "test_topic")
    public void listen(String in) {
        System.out.println(in);
    }

    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("test_topic").partitions(1).replicas(1).build();
    }


    @Bean
    public ApplicationRunner runner(KafkaTemplate<String, String> template) {
        return args -> {
            template.send("test_topic", "foo");
        };
    }
}

Answer 1

解决方案是在自定义 kafkaTemplate 中添加一个监听器：

@Bean
    public ProducerFactory<String, String> customProducerFactory() {
        Map<String, Object> configProps = new HashMap<>();
        configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "127.0.0.1:9092");
        configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, Serdes.String().serializer().getClass().getName());
        configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, Serdes.String().serializer().getClass().getName());
        DefaultKafkaProducerFactory<String, String> producerFactory = new DefaultKafkaProducerFactory<>(configProps);
        producerFactory.addListener(new MicrometerProducerListener<>(meterRegistry));
    }

@Bean
public KafkaTemplate<String, String> customProducer() {
    return new KafkaTemplate<>(customProducerFactory());
}

Answer 2

我刚刚在 Boot 2.4.2 (spring-kafka 2.6.5) 上尝试过，没有任何问题：

@SpringBootApplication
public class So65791799Application {

    public static void main(String[] args) {
        SpringApplication.run(So65791799Application.class, args);
    }


    @KafkaListener(id = "so65791799", topics = "so65791799")
    public void listen(String in) {
        System.out.println(in);
    }

    @Bean
    public NewTopic topic() {
        return TopicBuilder.name("so65791799").partitions(1).replicas(1).build();
    }


    @Bean
    public ApplicationRunner runner(KafkaTemplate<String, String> template) {
        return args -> {
            template.send("so65791799", "foo");
        };
    }

}

server:
  port: 9091
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      probes:
        enabled: true

spring:
  jmx:
    enabled: true

  kafka:
    consumer:
      auto-offset-reset: earliest

http://localhost:9091/actuator/prometheus

...
# HELP kafka_consumer_fetch_manager_records_per_request_avg The average number of records in each request
# TYPE kafka_consumer_fetch_manager_records_per_request_avg gauge
kafka_consumer_fetch_manager_records_per_request_avg{client_id="consumer-so65791799-1",kafka_version="2.6.0",spring_id="kafkaConsumerFactory.consumer-so65791799-1",} 0.5
...

我把它放回 Boot 2.3.5，它仍然对我有用。