docs: private void registerPerformanceMonitor(String beanName,
                                              BeanDefinitionRegistry registry) {
  
          String perfMonitorName = beanName + "PerformanceMonitor";
          if (!registry.containsBeanDefinition(perfMonitorName))  {
              BeanDefinitionBuilder initializer =
                  BeanDefinitionBuilder.rootBeanDefinition(PerformanceMonitorBean.class);
              registry.registerBeanDefinition(perfMonitorName, initializer.getBeanDefinition());
          }
      }