code: protected void noteResponse(ServerStats stats, ClientRequest request, Object response, long responseTime) {
      	if (stats == null) {
      		return;
      	}
          try {
              recordStats(stats, responseTime);
              RetryHandler errorHandler = getRetryHandler();
              if (errorHandler != null && response != null) {
                  stats.clearSuccessiveConnectionFailureCount();
              } 
          } catch (Exception ex) {
              logger.error("Error noting stats for client {}", clientName, ex);
          }            
      }
docs: This is called after a response is received from the client
  to update related stats.