docs: def do_alarm_definition_create(mc, args):
      '''Create an alarm definition.'''
      fields = {}
      fields['name'] = args.name
      if args.description:
          fields['description'] = args.description
      fields['expression'] = args.expression
      if args.alarm_actions:
          fields['alarm_actions'] = args.alarm_actions
      if args.ok_actions:
          fields['ok_actions'] = args.ok_actions
      if args.undetermined_actions:
          fields['undetermined_actions'] = args.undetermined_actions
      if args.severity:
          if not _validate_severity(args.severity):
              return
          fields['severity'] = args.severity
      if args.match_by:
          fields['match_by'] = args.match_by.split(',')
      try:
          alarm = mc.alarm_definitions.create(**fields)
      except (osc_exc.ClientException, k_exc.HttpError) as he:
          raise osc_exc.CommandError('%s\n%s' % (he.message, he.details))
      else:
          print(jsonutils.dumps(alarm, indent=2))