errs = AppendValidation(errs, validateHTTPDirectResponse(http.DirectResponse))
	errs = AppendValidation(errs, validateHTTPRetry(http.Retries))
	errs = AppendValidation(errs, validateHTTPRewrite(http.Rewrite))
	errs = AppendValidation(errs, validateAuthorityRewrite(http.Rewrite, http.Headers))
	errs = AppendValidation(errs, validateHTTPRouteDestinations(http.Route, gatewaySemantics))
	if http.Timeout != nil {

		}
		if err := agent.ValidatePort(port.Port); err != nil {
			errs = multierror.Append(errs,
				fmt.Errorf("invalid service port value %d for %q: %v", port.Port, port.Name, err))
		}
	}
	return errs
}

// Validate ensures that the service instance is well-defined
func (instance *ServiceInstance) Validate() error {
	var errs error
	if instance.Service == nil {

						errs = appendErrors(errs, check(len(src.Namespaces) != 0, "From.Namespaces"))
						errs = appendErrors(errs, check(len(src.NotNamespaces) != 0, "From.NotNamespaces"))
						errs = appendErrors(errs, check(len(src.Principals) != 0, "From.Principals"))
						errs = appendErrors(errs, check(len(src.NotPrincipals) != 0, "From.NotPrincipals"))

func IsConfigMapKey(value string) []string {
	var errs []string
	if len(value) > DNS1123SubdomainMaxLength {
		errs = append(errs, MaxLenError(DNS1123SubdomainMaxLength))
	}
	if !configMapKeyRegexp.MatchString(value) {
		errs = append(errs, RegexError(configMapKeyErrMsg, configMapKeyFmt, "key.name", "KEY_NAME", "key-name"))
	}
	errs = append(errs, hasChDirPrefix(value)...)
	return errs
}

		},
	}

	for k, tc := range testcases {
		errs := ValidateObjectMetaUpdate(&tc.New, &tc.Old, field.NewPath("field"))
		if len(errs) != len(tc.ExpectedErrs) {
			t.Logf("%s: Expected: %#v", k, tc.ExpectedErrs)
			t.Logf("%s: Got: %#v", k, errs)
			t.Errorf("%s: expected %d errors, got %d", k, len(tc.ExpectedErrs), len(errs))
			continue
		}
		for i := range errs {
			if errs[i].Error() != tc.ExpectedErrs[i] {

	}
	for i := range labelNameErrorCases {
		errs := ValidateLabels(labelNameErrorCases[i].labels, field.NewPath("field"))
		if len(errs) != 1 {
			t.Errorf("case[%d]: expected failure", i)
		} else {
			if !strings.Contains(errs[0].Detail, labelNameErrorCases[i].expect) {
				t.Errorf("case[%d]: error details do not include %q: %q", i, labelNameErrorCases[i].expect, errs[0].Detail)
			}
		}
	}

	var errs []error
	if len(profile.SchedulerName) == 0 {
		errs = append(errs, field.Required(path.Child("schedulerName"), ""))
	}
	errs = append(errs, validatePercentageOfNodesToScore(path.Child("percentageOfNodesToScore"), profile.PercentageOfNodesToScore))
	errs = append(errs, validatePluginConfig(path, apiVersion, profile)...)
	return errs
}

// Validate checks Options and return a slice of found errs.
func (s *Options) Validate() []error {
	var errs []error

	errs = append(errs, s.Etcd.Validate()...)
	errs = append(errs, validateAPIPriorityAndFairness(s)...)
	errs = append(errs, s.SecureServing.Validate()...)
	errs = append(errs, s.Authentication.Validate()...)
	errs = append(errs, s.Authorization.Validate()...)
	errs = append(errs, s.Audit.Validate()...)

			if len(jsonTag) > 0 || len(protoTag) > 0 {
				errs = append(errs, fmt.Errorf("internal types should not have json or protobuf tags. %#v has tag on field %v: %v.\n%s", gvk, f.Name, f.Tag, fmtParentString(parents)))
			}

			errs = append(errs, ensureNoTags(gvk, f.Type, parents, typesAllowedTags)...)
		}

	default:
		errs = append(errs, fmt.Errorf("unexpected type %v in %#v.\n%s", tp.Kind(), gvk, fmtParentString(parents)))

	e := &joinError{
		errs: make([]error, 0, n),
	}
	for _, err := range errs {
		if err != nil {
			e.errs = append(e.errs, err)
		}
	}
	return e
}

type joinError struct {
	errs []error
}

func (e *joinError) Error() string {
	// Since Join returns nil if every value in errs is nil,
	// e.errs cannot be empty.
	if len(e.errs) == 1 {
		return e.errs[0].Error()
	}

	b := []byte(e.errs[0].Error())