docs: public void collectRouteStats(String route, int statusCode) {
  
          // increments 200, 301, 401, 503, etc. status counters
          final String preciseStatusString = String.format("status_%d", statusCode);
          NamedCountingMonitor preciseStatus = namedStatusMap.get(preciseStatusString);
          if (preciseStatus == null) {
              preciseStatus = new NamedCountingMonitor(preciseStatusString);
              NamedCountingMonitor found = namedStatusMap.putIfAbsent(preciseStatusString, preciseStatus);
              if (found != null) preciseStatus = found;
              else MonitorRegistry.getInstance().registerObject(preciseStatus);
          }
          preciseStatus.increment();
  
          // increments 2xx, 3xx, 4xx, 5xx status counters
          final String summaryStatusString = String.format("status_%dxx", statusCode / 100);
          NamedCountingMonitor summaryStatus = namedStatusMap.get(summaryStatusString);
          if (summaryStatus == null) {
              summaryStatus = new NamedCountingMonitor(summaryStatusString);
              NamedCountingMonitor found = namedStatusMap.putIfAbsent(summaryStatusString, summaryStatus);
              if (found != null) summaryStatus = found;
              else MonitorRegistry.getInstance().registerObject(summaryStatus);
          }
          summaryStatus.increment();
  
          // increments route and status counter
          if (route == null) route = "ROUTE_NOT_FOUND";
          route = route.replace("/", "_");
          ConcurrentHashMap<Integer, RouteStatusCodeMonitor> statsMap = routeStatusMap.get(route);
          if (statsMap == null) {
              statsMap = new ConcurrentHashMap<Integer, RouteStatusCodeMonitor>();
              routeStatusMap.putIfAbsent(route, statsMap);
          }
          RouteStatusCodeMonitor sd = statsMap.get(statusCode);
          if (sd == null) {
              //don't register only 404 status codes (these are garbage endpoints)
              if (statusCode == 404) {
                  if (statsMap.size() == 0) {
                      return;
                  }
              }
  
              sd = new RouteStatusCodeMonitor(route, statusCode);
              RouteStatusCodeMonitor sd1 = statsMap.putIfAbsent(statusCode, sd);
              if (sd1 != null) {
                  sd = sd1;
              } else {
                  MonitorRegistry.getInstance().registerObject(sd);
              }
          }
          sd.update();
      }