docs: def list(ctx, scenario_name, format):  # pragma: no cover
      """ Lists status of instances. """
      args = ctx.obj.get('args')
      subcommand = base._get_subcommand(__name__)
      command_args = {
          'subcommand': subcommand,
          'format': format,
      }
  
      statuses = []
      s = scenarios.Scenarios(
          base.get_configs(args, command_args), scenario_name)
      for scenario in s:
          statuses.extend(base.execute_subcommand(scenario.config, subcommand))
  
      headers = [util.title(name) for name in status.get_status()._fields]
      if format == 'simple' or format == 'plain':
          table_format = 'simple'
          if format == 'plain':
              headers = []
              table_format = format
          _print_tabulate_data(headers, statuses, table_format)
      else:
          _print_yaml_data(headers, statuses)