Metrics.java 文件源码

private static void registerSysStats(){
  REGISTRY.registerAll(scoped("gc", new GarbageCollectorMetricSet()));
  REGISTRY.registerAll(scoped("buffer-pool", new BufferPoolMetricSet(ManagementFactory.getPlatformMBeanServer())));
  REGISTRY.registerAll(scoped("memory", new MemoryUsageGaugeSet()));
  REGISTRY.registerAll(scoped("threads", new ThreadStatesGaugeSet()));
}