docs: public PerfCounter get(String counter)
      {
          // Admited: could get a little race condition at the very beginning, but all that'll happen is that we'll lose a handful of tracking event, a loss far outweighed by overall reduced contention.
          if (!this.Counters.containsKey(counter))
              this.Counters.put(counter, new PerfCounter(false));
          return this.Counters.get(counter);
      }