spring-boot-starter-actuator与hystrix-servo-metrics-publisher相冲突

Question

我使用Spring-boot 1.4.3.RELEASE和Netflix Hystrix，我将通过JMX提供Hystrix指标。 Hystrix通过此代码段包含在项目中

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-dependencies</artifactId>
      <version>Brixton.SR5</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

对于通过JMX的指标，我使用hystrix-servo-metrics-publisher 1.5.9

<dependency>
  <groupId>com.netflix.hystrix</groupId>
  <artifactId>hystrix-servo-metrics-publisher</artifactId>
  <version>1.5.9</version>
</dependency>

hystrix-servo-metrics-publisher易于使用。它足以提供一个单行的静态块 HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance()); 如图所示

@EnableCircuitBreaker
@SpringBootApplication
public class ExampleApplication extends SpringBootServletInitializer {
  static {
    HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance());
  }

  @Override
  protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
    return application.sources(ExampleApplication.class);
  }

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

效果很好。

但我们的项目还需要Spring Boot Actuator。添加依赖项

之后

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

hystrix-servo-metrics-publisher不再起作用了。包com.netlix.servo在JMX MBeans / attributes中不可用。

这是一个小示例项目，其中禁用了spring-boot-starter-actuator依赖项： hystrix-servo-metrics-publisher-jmx-example

如果依赖项已启用，则hystrix-servo-metrics-publisher不再有效。

Answer 1

更新： 我注意到您在示例项目中使用Spring Boot 1.4.3，并且您的项目设置不正确。对于Spring Boot 2.0.x，情况有所不同，请参见下文。

示例项目设置问题

您正在使用hystrix-servo-metrics-publisher版本1.5.9。该版本与Spring Cloud 1.5.3使用的Hystrix版本Brixton.SR5不兼容。您可以通过启动应用程序，调用http://localhost:8080/remotecall（以创建初始Hystrix指标），然后调用http://localhost:8080/metrics（以访问执行器端点）来观察不兼容性。然后，您将得到一个java.lang.NoSuchMethodError: com.netflix.hystrix.HystrixThreadPoolProperties.maximumSize()Lcom/netflix/hystrix/strategy/properties/HystrixProperty;。将版本设置为1.5.3可解决此问题。

Spring Boot 1.x的解决方案

使用ServoMetricsAutoConfiguration导致JMX度量标准在Actuator中不再可见的原因，如果使用Spring Boot Actuator，则将激活它。在这里，公开了一个监视注册表bean，其配置取决于SpringMetricsConfigBean。新的默认注册表类为BasicMonitorRegistry。

要恢复原来的默认JMX监视器注册表，请在行resources/application.properties上添加netflix.metrics.servo.registryClass=com.netflix.servo.jmx.JmxMonitorRegistry。 这样，通过JMX和Spring Actuator指标端点即可公开指标。

Spring Boot 2.0.x解决方案

对于Spring Boot 2，问题不同。我将问题归结为io.micrometer.core.instrument.binder.hystrix.HystrixMetricsBinder（micrometer是spring-boot-actuator-autoconfigure的依赖项）。在此，当触发MicrometerMetricsPublisher类时，任何现有的发布者都将被MetricsAutoConfiguration替换。因此，语句HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance());并没有达到预期的效果。发布者只是被丢弃...

Hystrix插件的问题在于，每种插件类型一次只能注册一个插件。因此，一种解决方案是用委派给多个插件实例的“元”插件替换现有插件。 HystrixSecurityAutoConfiguration中也使用了这种方法。通过下面的配置类，我设法通过JMX和Spring Boot Actuator公开了Hystrix指标（例如/actuator/metrics/hystrix.execution）：

import com.netflix.hystrix.*;
import com.netflix.hystrix.contrib.servopublisher.HystrixServoMetricsPublisher;
import com.netflix.hystrix.strategy.HystrixPlugins;
import com.netflix.hystrix.strategy.concurrency.HystrixConcurrencyStrategy;
import com.netflix.hystrix.strategy.eventnotifier.HystrixEventNotifier;
import com.netflix.hystrix.strategy.executionhook.HystrixCommandExecutionHook;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisher;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherCollapser;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherCommand;
import com.netflix.hystrix.strategy.metrics.HystrixMetricsPublisherThreadPool;
import com.netflix.hystrix.strategy.properties.HystrixPropertiesStrategy;
import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

@Configuration
@ConditionalOnClass({Hystrix.class, HystrixServoMetricsPublisher.class})
@AutoConfigureAfter(MetricsAutoConfiguration.class)
public class HystrixServoAndMicrometerConfig {

    @PostConstruct
    public void init() {
        // Keeps references of existing Hystrix plugins
        HystrixMetricsPublisher existingMetricsPublisher = HystrixPlugins.getInstance().getMetricsPublisher();
        HystrixConcurrencyStrategy concurrencyStrategy = HystrixPlugins.getInstance().getConcurrencyStrategy();
        HystrixEventNotifier eventNotifier = HystrixPlugins.getInstance().getEventNotifier();
        HystrixPropertiesStrategy propertiesStrategy = HystrixPlugins.getInstance().getPropertiesStrategy();
        HystrixCommandExecutionHook commandExecutionHook = HystrixPlugins.getInstance().getCommandExecutionHook();

        if (existingMetricsPublisher != null) {
            HystrixPlugins.reset();
            // Registers existing plugins except the new ServoAndExistingMetricsPublisher plugin
            HystrixPlugins.getInstance().registerMetricsPublisher(new ServoAndExistingMetricsPublisher(
                    existingMetricsPublisher, HystrixServoMetricsPublisher.getInstance()));
            HystrixPlugins.getInstance().registerConcurrencyStrategy(concurrencyStrategy);
            HystrixPlugins.getInstance().registerEventNotifier(eventNotifier);
            HystrixPlugins.getInstance().registerPropertiesStrategy(propertiesStrategy);
            HystrixPlugins.getInstance().registerCommandExecutionHook(commandExecutionHook);
        } else {
            HystrixPlugins.getInstance().registerMetricsPublisher(HystrixServoMetricsPublisher.getInstance());
        }
    }

    private static class ServoAndExistingMetricsPublisher extends HystrixMetricsPublisher {

        private static class ServoAndOtherMetricsPublisherCommand implements HystrixMetricsPublisherCommand {
            private final HystrixMetricsPublisherCommand servoMetricsPublisherCommand;
            private final HystrixMetricsPublisherCommand existingMetricsPublisherCommand;

            ServoAndOtherMetricsPublisherCommand(HystrixMetricsPublisherCommand servoMetricsPublisherCommand,
                                                 HystrixMetricsPublisherCommand existingMetricsPublisherCommand) {
                this.servoMetricsPublisherCommand = servoMetricsPublisherCommand;
                this.existingMetricsPublisherCommand = existingMetricsPublisherCommand;
            }

            @Override
            public void initialize() {
                servoMetricsPublisherCommand.initialize();
                existingMetricsPublisherCommand.initialize();
            }
        }

        private final HystrixMetricsPublisher existingMetricsPublisher;
        private final HystrixMetricsPublisher servoMetricsPublisher;

        ServoAndExistingMetricsPublisher(HystrixMetricsPublisher existingMetricsPublisher,
                                         HystrixMetricsPublisher servoMetricsPublisher) {
            this.existingMetricsPublisher = existingMetricsPublisher;
            this.servoMetricsPublisher = servoMetricsPublisher;
        }

        @Override
        public HystrixMetricsPublisherCommand getMetricsPublisherForCommand(HystrixCommandKey commandKey, HystrixCommandGroupKey commandGroupKey, HystrixCommandMetrics metrics, HystrixCircuitBreaker circuitBreaker, HystrixCommandProperties properties) {
            HystrixMetricsPublisherCommand servoMetricsPublisherCommand = servoMetricsPublisher.getMetricsPublisherForCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties);
            HystrixMetricsPublisherCommand existingMetricsPublisherCommand = existingMetricsPublisher.getMetricsPublisherForCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties);
            return new ServoAndOtherMetricsPublisherCommand(servoMetricsPublisherCommand, existingMetricsPublisherCommand);
        }

        @Override
        public HystrixMetricsPublisherThreadPool getMetricsPublisherForThreadPool(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolMetrics metrics, HystrixThreadPoolProperties properties) {
            return servoMetricsPublisher.getMetricsPublisherForThreadPool(threadPoolKey, metrics, properties);
        }

        @Override
        public HystrixMetricsPublisherCollapser getMetricsPublisherForCollapser(HystrixCollapserKey collapserKey, HystrixCollapserMetrics metrics, HystrixCollapserProperties properties) {
            return servoMetricsPublisher.getMetricsPublisherForCollapser(collapserKey, metrics, properties);
        }
    }
}