code: Long getCounterValueAsLong(final CounterMap counters, final String counterGroupName,
        final String counterName) {
      Counter c1 = counters.getCounter(counterGroupName, counterName);
      if (c1 != null) {
        return c1.getValue();
      } else {
        return 0L;
      }
    }
docs: return a value for that counters from the NavigableMap as a Long
  @param key
  @param infoValues
  @return counter value as Long or 0L