private void addMetricsHandler(String handlerClass, BindingPattern rootBinding, BindingPattern innerBinding) {
        Handler handler = new Handler(new ComponentModel(handlerClass, null, null, null));
        handler.addServerBindings(rootBinding, innerBinding);
        addComponent(handler);
    }
The heap size % of total memory available to the JVM process.
config-model/src/main/java/com/yahoo/vespa/model/container/ApplicationContainerCluster.java