diff --git a/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta.go b/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta.go
index 3e234eb11dc..4d9efe3f72b 100644
--- a/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta.go
+++ b/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta.go
@@ -33,7 +33,7 @@ import (
 // FieldImmutableErrorMsg is a error message for field is immutable.
 const FieldImmutableErrorMsg string = `field is immutable`
 
-const totalAnnotationSizeLimitB int = 256 * (1 << 10) // 256 kB
+const TotalAnnotationSizeLimitB int = 256 * (1 << 10) // 256 kB
 
 // BannedOwners is a black list of object that are not allowed to be owners.
 var BannedOwners = map[schema.GroupVersionKind]struct{}{
@@ -46,19 +46,28 @@ var ValidateClusterName = NameIsDNS1035Label
 // ValidateAnnotations validates that a set of annotations are correctly defined.
 func ValidateAnnotations(annotations map[string]string, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
-	var totalSize int64
-	for k, v := range annotations {
+	for k := range annotations {
 		for _, msg := range validation.IsQualifiedName(strings.ToLower(k)) {
 			allErrs = append(allErrs, field.Invalid(fldPath, k, msg))
 		}
-		totalSize += (int64)(len(k)) + (int64)(len(v))
 	}
-	if totalSize > (int64)(totalAnnotationSizeLimitB) {
-		allErrs = append(allErrs, field.TooLong(fldPath, "", totalAnnotationSizeLimitB))
+	if err := ValidateAnnotationsSize(annotations); err != nil {
+		allErrs = append(allErrs, field.TooLong(fldPath, "", TotalAnnotationSizeLimitB))
 	}
 	return allErrs
 }
 
+func ValidateAnnotationsSize(annotations map[string]string) error {
+	var totalSize int64
+	for k, v := range annotations {
+		totalSize += (int64)(len(k)) + (int64)(len(v))
+	}
+	if totalSize > (int64)(TotalAnnotationSizeLimitB) {
+		return fmt.Errorf("annotations size %d is larger than limit %d", totalSize, TotalAnnotationSizeLimitB)
+	}
+	return nil
+}
+
 func validateOwnerReference(ownerReference metav1.OwnerReference, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 	gvk := schema.FromAPIVersionAndKind(ownerReference.APIVersion, ownerReference.Kind)
diff --git a/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta_test.go b/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta_test.go
index ebd6c7e7c7a..349da67f8aa 100644
--- a/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta_test.go
+++ b/staging/src/k8s.io/apimachinery/pkg/api/validation/objectmeta_test.go
@@ -452,10 +452,10 @@ func TestValidateAnnotations(t *testing.T) {
 		{"1234/5678": "bar"},
 		{"1.2.3.4/5678": "bar"},
 		{"UpperCase123": "bar"},
-		{"a": strings.Repeat("b", totalAnnotationSizeLimitB-1)},
+		{"a": strings.Repeat("b", TotalAnnotationSizeLimitB-1)},
 		{
-			"a": strings.Repeat("b", totalAnnotationSizeLimitB/2-1),
-			"c": strings.Repeat("d", totalAnnotationSizeLimitB/2-1),
+			"a": strings.Repeat("b", TotalAnnotationSizeLimitB/2-1),
+			"c": strings.Repeat("d", TotalAnnotationSizeLimitB/2-1),
 		},
 	}
 	for i := range successCases {
@@ -485,10 +485,10 @@ func TestValidateAnnotations(t *testing.T) {
 		}
 	}
 	totalSizeErrorCases := []map[string]string{
-		{"a": strings.Repeat("b", totalAnnotationSizeLimitB)},
+		{"a": strings.Repeat("b", TotalAnnotationSizeLimitB)},
 		{
-			"a": strings.Repeat("b", totalAnnotationSizeLimitB/2),
-			"c": strings.Repeat("d", totalAnnotationSizeLimitB/2),
+			"a": strings.Repeat("b", TotalAnnotationSizeLimitB/2),
+			"c": strings.Repeat("d", TotalAnnotationSizeLimitB/2),
 		},
 	}
 	for i := range totalSizeErrorCases {
diff --git a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/lastappliedupdater.go b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/lastappliedupdater.go
index ad651a2b59d..7cd4eb1289b 100644
--- a/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/lastappliedupdater.go
+++ b/staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/lastappliedupdater.go
@@ -21,12 +21,11 @@ import (
 
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/meta"
+	apimachineryvalidation "k8s.io/apimachinery/pkg/api/validation"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
-const totalAnnotationSizeLimitB int64 = 256 * (1 << 10) // 256 kB
-
 type lastAppliedUpdater struct {
 	fieldManager Manager
 }
@@ -94,7 +93,7 @@ func setLastApplied(obj runtime.Object, value string) error {
 		annotations = map[string]string{}
 	}
 	annotations[corev1.LastAppliedConfigAnnotation] = value
-	if isAnnotationsValid(annotations) != nil {
+	if err := apimachineryvalidation.ValidateAnnotationsSize(annotations); err != nil {
 		delete(annotations, corev1.LastAppliedConfigAnnotation)
 	}
 	accessor.SetAnnotations(annotations)
@@ -120,14 +119,3 @@ func buildLastApplied(obj runtime.Object) (string, error) {
 	}
 	return string(lastApplied), nil
 }
-
-func isAnnotationsValid(annotations map[string]string) error {
-	var totalSize int64
-	for k, v := range annotations {
-		totalSize += (int64)(len(k)) + (int64)(len(v))
-	}
-	if totalSize > (int64)(totalAnnotationSizeLimitB) {
-		return fmt.Errorf("annotations size %d is larger than limit %d", totalSize, totalAnnotationSizeLimitB)
-	}
-	return nil
-}