code: @Override
      public String[] black_box(final int maxSize) throws DevFailed {
          MDC.setContextMap(contextMap);
          xlogger.entry();
          // deviceMonitoring.addRequest("black_box");
          if (maxSize <= 0) {
              throw DevFailedUtils.newDevFailed(ExceptionMessages.BLACK_BOX_ARG, maxSize + " is not a good size");
          }
          xlogger.exit();
          return deviceMonitoring.getBlackBox(maxSize);
      }
docs: Get the clients' requests history
  
  @param maxSize The maximum depth of history
  @return the request history