code: private StatValue newLongStatValue(String valueName) {
          StatValue sv = StatValueFactory.createStatValue(0L, valueName, Constants.getDefaultIntervals());
  		addStatValues(sv);
  		return sv;
      }
docs: Creates new {@link net.anotheria.moskito.core.stats.StatValue} that holds the long value with given name
  and default intervals.
  
  @param valueName name of the stat value.
  
  @return {@link net.anotheria.moskito.core.stats.StatValue}.