provider/kubernetes: Ignore k8s internal labels

Fixes #13716

builtin/providers/kubernetes/structures.go

@@ -77,11 +77,11 @@ func expandStringSlice(s []interface{}) []string {
 
 func flattenMetadata(meta metav1.ObjectMeta) []map[string]interface{} {
 	m := make(map[string]interface{})
-	m["annotations"] = filterAnnotations(meta.Annotations)
+	m["annotations"] = removeInternalKeys(meta.Annotations)
 	if meta.GenerateName != "" {
 		m["generate_name"] = meta.GenerateName
 	}
-	m["labels"] = meta.Labels
+	m["labels"] = removeInternalKeys(meta.Labels)
 	m["name"] = meta.Name
 	m["resource_version"] = meta.ResourceVersion
 	m["self_link"] = meta.SelfLink
@@ -95,16 +95,16 @@ func flattenMetadata(meta metav1.ObjectMeta) []map[string]interface{} {
 	return []map[string]interface{}{m}
 }
 
-func filterAnnotations(m map[string]string) map[string]string {
+func removeInternalKeys(m map[string]string) map[string]string {
 	for k, _ := range m {
-		if isInternalAnnotationKey(k) {
+		if isInternalKey(k) {
 			delete(m, k)
 		}
 	}
 	return m
 }
 
-func isInternalAnnotationKey(annotationKey string) bool {
+func isInternalKey(annotationKey string) bool {
 	u, err := url.Parse("//" + annotationKey)
 	if err == nil && strings.HasSuffix(u.Hostname(), "kubernetes.io") {
 		return true

builtin/providers/kubernetes/structures_test.go

@@ -5,7 +5,7 @@ import (
 	"testing"
 )
 
-func TestIsInternalAnnotationKey(t *testing.T) {
+func TestIsInternalKey(t *testing.T) {
 	testCases := []struct {
 		Key      string
 		Expected bool
@@ -20,7 +20,7 @@ func TestIsInternalAnnotationKey(t *testing.T) {
 	}
 	for i, tc := range testCases {
 		t.Run(fmt.Sprintf("%d", i), func(t *testing.T) {
-			isInternal := isInternalAnnotationKey(tc.Key)
+			isInternal := isInternalKey(tc.Key)
 			if tc.Expected && isInternal != tc.Expected {
 				t.Fatalf("Expected %q to be internal", tc.Key)
 			}