docs: public static void validateMetadata(Map<String, String> metadata) throws ServiceException {
          for ( String key : metadata.keySet()){
              if (!validateRequiredField(key, metaKeyRegEx)){
                 throw new ServiceException(
                      ErrorCode.SERVICE_INSTANCE_METAKEY_FORMAT_ERROR,
                      ErrorCode.SERVICE_INSTANCE_METAKEY_FORMAT_ERROR.getMessageTemplate(),key
                 );
              }
          }
  
      }