docs: protected final void copyValue(ExtendedStatistic from, ExtendedStatistic to) {
        try {
           double value = container.getValue(from);
           container.addValue(to, value);
           if (log.isDebugEnabled()) {
              log.debugf("Copy value [%s] from [%s] to [%s]", value, from, to);
           }
        } catch (ExtendedStatisticNotFoundException e) {
           log.unableToCopyValue(from, to, e);
        }
     }