docs: public static void registerMBean(final ObjectInstance objectInstance, final String mBeanAttributeName, MetricName metricName, Metric2Registry metricRegistry) {
  		metricRegistry.register(metricName, new Gauge<Object>() {
  			@Override
  			public Object getValue() {
  				return getValueFromMBean(objectInstance, mBeanAttributeName);
  			}
  		});
  	}