code: def rollback(self, label=None, plane='sdr'):
          
          begin = time.time()
          rb_label = self._chain.target_device.rollback(label=label, plane=plane)
          elapsed = time.time() - begin
          if label:
              self.emit_message("Configuration rollback last {:.0f}s. Label: {}".format(elapsed, rb_label),
                                log_level=logging.INFO)
          else:
              self.emit_message("Configuration failed.", log_level=logging.WARNING)
  
          return rb_label
docs: Rollback the configuration.
  
          This method rolls back the configuration on the device.
  
          Args:
              label (text): The configuration label ID
              plane: (text): sdr or admin
  
          Returns:
              A string with commit label or None