protected <T> void addFailureApiDocRegister(final T t) {
        if (t instanceof ApiDocRegisterDTO) {
            ApiDocRegisterDTO dto = (ApiDocRegisterDTO) t;
            String address = String.join(":", dto.getContextPath(), dto.getApiPath(), dto.getHttpMethod().toString(), dto.getRpcType());
            addToFail(new Holder(t, address, Constants.API_DOC_TYPE));
        }
    }
Add failure ApiDoc 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