minor updates

pkg/kubelet/certificate/kubelet.go

@@ -245,7 +245,7 @@ func NewKubeletClientCertificateManager(
 func NewKubeletServerCertificateDynamicFileManager(certFile, keyFile string) (certificate.Manager, error) {
 	c, err := dynamiccertificates.NewDynamicServingContentFromFiles("kubelet-server-cert-files", certFile, keyFile)
 	if err != nil {
-		return nil, fmt.Errorf("no certificate available: %w", err)
+		return nil, fmt.Errorf("unable to set up dynamic certificate manager for kubelet server cert files: %w", err)
 	}
 	m := &kubeletServerCertificateDynamicFileManager{
 		dynamicCertificateContent: c,
@@ -276,7 +276,6 @@ func (m *kubeletServerCertificateDynamicFileManager) Enqueue() {
 	}
 	m.currentTLSCertificate.Store(&cert)
 	klog.V(4).InfoS("loaded certificate and key pair in kubelet server certificate manager", "certFile", m.certFile, "keyFile", m.keyFile)
-
 }
 
 // Current returns the last valid certificate key pair loaded from files.
@@ -298,7 +297,7 @@ func (m *kubeletServerCertificateDynamicFileManager) Stop() {
 	}
 }
 
-// ServerHealthy always return true since the file manager doesn't communicate with any server
+// ServerHealthy always returns true since the file manager doesn't communicate with any server
 func (m *kubeletServerCertificateDynamicFileManager) ServerHealthy() bool {
 	return true
 }

pkg/kubelet/certificate/kubelet_test.go

@@ -228,7 +228,7 @@ func TestKubeletServerCertificateFromFiles(t *testing.T) {
 				t.Errorf("expected the same loaded certificate object when there is no cert file change, got different")
 			}
 
-			// simulate certificate files update in the background
+			// simulate certificate files updated in the background
 			if _, _, err := createFn(certDir); err != nil {
 				t.Fatalf("got errors when rotating certificate files in the test: %v", err)
 			}
@@ -256,7 +256,7 @@ func TestKubeletServerCertificateFromFiles(t *testing.T) {
 
 			time.Sleep(1 * time.Second)
 			if m.Current() == nil {
-				t.Errorf("expected the manager still provide cached content when certificate file was not available")
+				t.Errorf("expected the manager still provides cached content when certificate file was not available")
 			}
 		})
 	}