Add +optional tag to all fields with omitempty json tag

pkg/runtime/serializer/json/meta.go

@@ -47,8 +47,10 @@ type SimpleMetaFactory struct {
 // encoding of an object, or an error.
 func (SimpleMetaFactory) Interpret(data []byte) (*unversioned.GroupVersionKind, error) {
 	findKind := struct {
+		// +optional
 		APIVersion string `json:"apiVersion,omitempty"`
-		Kind       string `json:"kind,omitempty"`
+		// +optional
+		Kind string `json:"kind,omitempty"`
 	}{}
 	if err := json.Unmarshal(data, &findKind); err != nil {
 		return nil, fmt.Errorf("couldn't get version/kind; json parse error: %v", err)

pkg/runtime/types.go

@@ -34,8 +34,10 @@ package runtime
 // +protobuf=true
 // +k8s:openapi-gen=true
 type TypeMeta struct {
+	// +optional
 	APIVersion string `json:"apiVersion,omitempty" yaml:"apiVersion,omitempty" protobuf:"bytes,1,opt,name=apiVersion"`
-	Kind       string `json:"kind,omitempty" yaml:"kind,omitempty" protobuf:"bytes,2,opt,name=kind"`
+	// +optional
+	Kind string `json:"kind,omitempty" yaml:"kind,omitempty" protobuf:"bytes,2,opt,name=kind"`
 }
 
 const (