spring boot 集成Actuator metrics不显示jvm信息

在Spring Boot项目中集成Actuator进行JVM信息监控，同时集成Prometheus进行展示。正常来说，访问metrics端点显示的内容信息应该如下：

{
  "names": [
    "jvm.threads.states",
    "jdbc.connections.active",
    "process.files.max",
    "jvm.memory.used",
    "jvm.gc.memory.promoted",
    "jvm.memory.max",
    "system.load.average.1m",
    "jvm.gc.max.data.size",
    "jdbc.connections.max",
    "jdbc.connections.min",
    "jvm.memory.committed",
    "system.cpu.count",
    "tomcat.global.sent",
    "jvm.buffer.memory.used",
    "tomcat.sessions.created",
    "jvm.threads.daemon",
    "system.cpu.usage",
    "jvm.gc.memory.allocated",
    "tomcat.global.request.max",
    "hikaricp.connections.idle",
    "hikaricp.connections.pending",
    "tomcat.global.request",
    "tomcat.sessions.expired",
    "hikaricp.connections",
    "jvm.threads.live",
    "jvm.threads.peak",
    "tomcat.global.received",
    "hikaricp.connections.active",
    "hikaricp.connections.creation",
    "process.uptime",
    "tomcat.sessions.rejected",
    "process.cpu.usage",
    "tomcat.threads.config.max",
    "jvm.classes.loaded",
    "hikaricp.connections.max",
    "hikaricp.connections.min",
    "jvm.classes.unloaded",
    "tomcat.global.error",
    "tomcat.sessions.active.current",
    "tomcat.sessions.alive.max",
    "jvm.gc.live.data.size",
    "log4j2.events",
    "hikaricp.connections.usage",
    "tomcat.threads.current",
    "jvm.gc.pause",
    "hikaricp.connections.timeout",
    "process.files.open",
    "jvm.buffer.count",
    "jvm.buffer.total.capacity",
    "tomcat.sessions.active.max",
    "hikaricp.connections.acquire",
    "tomcat.threads.busy",
    "process.start.time"
  ]
}

结果是该端点时只显示了如下信息：

{
  "names": [
    "jdbc.connections.active",
    "jdbc.connections.max",
    "jdbc.connections.min",
    "tomcat.global.sent",
    "tomcat.sessions.created",
    "tomcat.global.request.max",
    "hikaricp.connections.idle",
    "hikaricp.connections.pending",
    "tomcat.global.request",
    "tomcat.sessions.expired",
    "hikaricp.connections",
    "tomcat.global.received",
    "hikaricp.connections.active",
    "hikaricp.connections.creation",
    "tomcat.sessions.rejected",
    "tomcat.threads.config.max",
    "hikaricp.connections.max",
    "hikaricp.connections.min",
    "tomcat.global.error",
    "tomcat.sessions.active.current",
    "tomcat.sessions.alive.max",
    "hikaricp.connections.usage",
    "tomcat.threads.current",
    "hikaricp.connections.timeout",
    "tomcat.sessions.active.max",
    "hikaricp.connections.acquire",
    "tomcat.threads.busy"
  ]
}

引入的pom依赖如下：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>io.micrometer</groupId>
            <artifactId>micrometer-registry-prometheus</artifactId>
        </dependency>

对应的配置如下：

management:
  endpoints:
    jmx:
      exposure:
        include: '*'
    web:
      exposure:
        include: '*'
  metrics:
    tags:
      application: ${spring.application.name} 

那么，如何解决metrics端点不显示jvm信息的问题呢？

可在spring boot项目中添加如下配置项：

@Configuration
public class ActuatorMetricsConfig {

    @Bean
    InitializingBean forcePrometheusPostProcessor(BeanPostProcessor meterRegistryPostProcessor, PrometheusMeterRegistry registry) {
        return () -> meterRegistryPostProcessor.postProcessAfterInitialization(registry, "");
    }

}

重启，再次访问，会发现jvm相关的参数信息可正常访问了。

问题原因

出现问题的原因是spring boot中MeterRegistry初始化过早导致的。预计在spring boot2.5版本中进行修复。

在启动日志中可以看到：

2021-05-21 12:08:12.599  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'management.metrics-org.springframework.boot.actuate.autoconfigure.metrics.MetricsProperties' of type [org.springframework.boot.actuate.autoconfigure.metrics.MetricsProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:14.029  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.actuate.autoconfigure.metrics.data.RepositoryMetricsAutoConfiguration' of type [org.springframework.boot.actuate.autoconfigure.metrics.data.RepositoryMetricsAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:14.647  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusMetricsExportAutoConfiguration' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusMetricsExportAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:15.191  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'management.metrics.export.prometheus-org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusProperties' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:15.721  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'prometheusConfig' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusPropertiesConfigAdapter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:16.205  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'collectorRegistry' of type [io.prometheus.client.CollectorRegistry] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:16.732  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration' of type [org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:17.293  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'micrometerClock' of type [io.micrometer.core.instrument.Clock$1] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:17.950  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'prometheusMeterRegistry' of type [io.micrometer.prometheus.PrometheusMeterRegistry] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:18.598  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'repositoryTagsProvider' of type [org.springframework.boot.actuate.metrics.data.DefaultRepositoryTagsProvider] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-05-21 12:08:19.198  INFO 52357 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'metricsRepositoryMethodInvocationListener' of type [org.springframework.boot.actuate.metrics.data.MetricsRepositoryMethodInvocationListener] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

另外一个解决方案就是可以添加如下配置：

@Bean
public static MetricsRepositoryMethodInvocationListener metricsRepositoryMethodInvocationListener(MetricsProperties
        metricsProperties, @Lazy MeterRegistry registry, RepositoryTagsProvider tagsProvider) {
    Repository properties = metricsProperties.getData().getRepository();
    return new MetricsRepositoryMethodInvocationListener(registry, tagsProvider, properties.getMetricName(), 
        properties.getAutotime());
}

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