fix: [sc-118962] Unable to Retrieve TLS Parameters from Kubernetes Secrets with the Postgres Collector (#1724)

* use Data instead of StringData

Author: nvanthao

pkg/collect/util.go

@@ -208,20 +208,20 @@ func getTLSParamsFromSecret(ctx context.Context, client kubernetes.Interface, se
 		return "", "", "", errors.Wrap(err, "failed to get secret")
 	}
 
-	if val, ok := secret.StringData["cacert"]; ok {
-		caCert = val
+	if val, ok := secret.Data["cacert"]; ok {
+		caCert = string(val)
 	} else {
 		return "", "", "", fmt.Errorf("failed to find 'cacert' key for CA cert data in secret")
 	}
 
 	var foundClientCert, foundClientKey bool
-	if val, ok := secret.StringData["clientCert"]; ok {
-		clientCert = val
+	if val, ok := secret.Data["clientCert"]; ok {
+		clientCert = string(val)
 		foundClientCert = true
 	}
 
-	if val, ok := secret.StringData["clientKey"]; ok {
-		clientKey = val
+	if val, ok := secret.Data["clientKey"]; ok {
+		clientKey = string(val)
 		foundClientKey = true
 	}
 

pkg/collect/util_test.go

@@ -270,13 +270,18 @@ func createTLSSecret(t *testing.T, client kubernetes.Interface, secretData map[s
 	secretName := "secret-name-" + randStringRunes(20)
 	namespace := "namespace-" + randStringRunes(20)
 
+	data := make(map[string][]byte)
+	for k, v := range secretData {
+		data[k] = []byte(v)
+	}
+
 	_, err := client.CoreV1().Secrets(namespace).Create(
 		context.Background(),
 		&v1.Secret{
 			ObjectMeta: metav1.ObjectMeta{
 				Name: secretName,
 			},
-			StringData: secretData,
+			Data: data,
 		},
 		metav1.CreateOptions{},
 	)