Constructs LongMonitoredAttribute, by creating the
MonitoredAttributeInfo with 'Long' as the class type.
Users are expected to extend this class and provide the implementation
for getValue() and if needed clearState() as well.
super( name );
MonitoredAttributeInfoFactory f =
MonitoringFactories.getMonitoredAttributeInfoFactory();
MonitoredAttributeInfo maInfo = f.createMonitoredAttributeInfo(
description, Long.class, false, false );
this.setMonitoredAttributeInfo( maInfo );