System/JVM metrics - HeapMemoryUsageLoadMetric
9.2.3. HeapMemoryUsageLoadMetric Returns the heap memory usage as a percentage of max heap size e.g. @org.jboss.aop.microcontainer.aspects.jmx.JMX(name="jboss.web:service=HeapMemoryUsageLoadMetric",exposedInterface=org.jboss.modcluster.load.metric.LoadMetricMBean.class)