JAMon 2.74 is a minor release: New methods allow you to limit the number of monitors as well as tell how big the total monitor labels are. See these methods for more info:
MonitorFactory.setMaxNumMonitors(maxMonitors);
MonitorFactory.getMaxNumMonitors();
MonitorFactory.enableTotalKeySizeTracking();
MonitorFactory.disableTotalKeySizeTracking();
MonitorFactory.getTotalKeySize();