protected <T> void addFailureMetaDataRegister(final T t) {
        if (t instanceof MetaDataRegisterDTO) {
            MetaDataRegisterDTO dto = (MetaDataRegisterDTO) t;
            String fullPath = dto.getRpcType() + "://" + dto.getHost() + ":" + dto.getPort() + dto.getPath();
            addToFail(new Holder(t, fullPath, Constants.META_TYPE));
        }
    }
Add failure meta data register.

@param <T> the type parameter
@param t   the t
shenyu-register-center/shenyu-register-client/shenyu-register-client-api/src/main/java/org/apache/shenyu/register/client/api/FailbackRegistryRepository.java