remove deprecated Defaulter and Validator interfaces

Signed-off-by: Troy Connor <troy0820@users.noreply.github.com>

Author: troy0820

pkg/builder/webhook.go

@@ -171,11 +171,8 @@ func (blder *WebhookBuilder) getDefaultingWebhook() *admission.Webhook {
 	if defaulter := blder.customDefaulter; defaulter != nil {
 		return admission.WithCustomDefaulter(blder.mgr.GetScheme(), blder.apiType, defaulter).WithRecoverPanic(blder.recoverPanic)
 	}
-	if defaulter, ok := blder.apiType.(admission.Defaulter); ok {
-		return admission.DefaultingWebhookFor(blder.mgr.GetScheme(), defaulter).WithRecoverPanic(blder.recoverPanic)
-	}
 	log.Info(
-		"skip registering a mutating webhook, object does not implement admission.Defaulter or WithDefaulter wasn't called",
+		"skip registering a mutating webhook, object does not implement admission.CustomDefaulter or WithCustomDefaulter wasn't called",
 		"GVK", blder.gvk)
 	return nil
 }
@@ -202,11 +199,8 @@ func (blder *WebhookBuilder) getValidatingWebhook() *admission.Webhook {
 	if validator := blder.customValidator; validator != nil {
 		return admission.WithCustomValidator(blder.mgr.GetScheme(), blder.apiType, validator).WithRecoverPanic(blder.recoverPanic)
 	}
-	if validator, ok := blder.apiType.(admission.Validator); ok {
-		return admission.ValidatingWebhookFor(blder.mgr.GetScheme(), validator).WithRecoverPanic(blder.recoverPanic)
-	}
 	log.Info(
-		"skip registering a validating webhook, object does not implement admission.Validator or WithValidator wasn't called",
+		"skip registering a validating webhook, object does not implement admission.CustomValidator or WithCustomValidator wasn't called",
 		"GVK", blder.gvk)
 	return nil
 }

pkg/webhook/admission/defaulter.go

@@ -27,6 +27,9 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
+// Warnings represents warning messages.
+type Warnings []string
+
 // CustomValidator defines functions for validating an operation.
 // The object to be validated is passed into methods as a parameter.
 type CustomValidator interface {