code: func EncodeMetaInLabel(meta *types.EruMeta) string {
  	data, err := json.Marshal(meta)
  	if err != nil {
  		log.Errorf("[EncodeMetaInLabel] Encode meta failed %v", err)
  		return ""
  	}
  	return string(data)
  }
docs: // EncodeMetaInLabel encode meta to json