fix: use KUBERNETES_SERVICE_HOST env var instead of DNS

internal/serviceadapter/informer.go

@@ -48,11 +48,18 @@ func NewLoader(registry *Registry, namespace string) (*Loader, error) {
 	pool := x509.NewCertPool()
 	pool.AppendCertsFromPEM(caBytes)
 
+	// Use env vars injected by kubelet — no DNS dependency
+	host := os.Getenv("KUBERNETES_SERVICE_HOST")
+	port := os.Getenv("KUBERNETES_SERVICE_PORT")
+	if host == "" || port == "" {
+		return nil, fmt.Errorf("KUBERNETES_SERVICE_HOST/PORT not set")
+	}
+
 	return &Loader{
 		registry:  registry,
 		namespace: namespace,
 		token:     string(tokenBytes),
-		baseURL:   "https://kubernetes.default.svc",
+		baseURL:   fmt.Sprintf("https://%s:%s", host, port),
 		client: &http.Client{
 			Timeout: 30 * time.Second,
 			Transport: &http.Transport{