docs: def do_alarm_definition_patch(mc, args):
      '''Patch the alarm definition.'''
      fields = {}
      fields['alarm_id'] = args.id
      if args.name:
          fields['name'] = args.name
      if args.description:
          fields['description'] = args.description
      if args.expression:
          fields['expression'] = args.expression
      if args.alarm_actions:
          fields['alarm_actions'] = _arg_split_patch_update(args.alarm_actions, patch=True)
      if args.ok_actions:
          fields['ok_actions'] = _arg_split_patch_update(args.ok_actions, patch=True)
      if args.undetermined_actions:
          fields['undetermined_actions'] = _arg_split_patch_update(args.undetermined_actions,
                                                                   patch=True)
      if args.actions_enabled:
          if args.actions_enabled not in enabled_types:
              errmsg = ('Invalid value, not one of [' +
                        ', '.join(enabled_types) + ']')
              print(errmsg)
              return
          fields['actions_enabled'] = args.actions_enabled in ['true', 'True']
      if args.severity:
          if not _validate_severity(args.severity):
              return
          fields['severity'] = args.severity
      try:
          alarm = mc.alarm_definitions.patch(**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))