[release-1.11] 🌱 Reduce noisy logs

bootstrap/kubeadm/internal/controllers/kubeadmconfig_controller.go

@@ -152,7 +152,7 @@ func (r *KubeadmConfigReconciler) SetupWithManager(ctx context.Context, mgr ctrl
 }
 
 // Reconcile handles KubeadmConfig events.
-func (r *KubeadmConfigReconciler) Reconcile(ctx context.Context, req ctrl.Request) (_ ctrl.Result, rerr error) {
+func (r *KubeadmConfigReconciler) Reconcile(ctx context.Context, req ctrl.Request) (retRes ctrl.Result, rerr error) {
 	log := ctrl.LoggerFrom(ctx)
 
 	// Look up the kubeadm config
@@ -273,6 +273,12 @@ func (r *KubeadmConfigReconciler) Reconcile(ctx context.Context, req ctrl.Reques
 		if err := patchHelper.Patch(ctx, config, patchOpts...); err != nil {
 			rerr = kerrors.NewAggregate([]error{rerr, err})
 		}
+
+		// Note: controller-runtime logs a warning that non-empty result is ignored
+		// if error is not nil, so setting result here to empty to avoid noisy warnings.
+		if rerr != nil {
+			retRes = ctrl.Result{}
+		}
 	}()
 
 	// Ignore deleted KubeadmConfigs.

controlplane/kubeadm/internal/controllers/controller.go

@@ -261,6 +261,12 @@ func (r *KubeadmControlPlaneReconciler) Reconcile(ctx context.Context, req ctrl.
 				res = ctrl.Result{RequeueAfter: 20 * time.Second}
 			}
 		}
+
+		// Note: controller-runtime logs a warning that non-empty result is ignored
+		// if error is not nil, so setting result here to empty to avoid noisy warnings.
+		if reterr != nil {
+			res = ctrl.Result{}
+		}
 	}()
 
 	if !kcp.DeletionTimestamp.IsZero() {

util/apiwarnings/expressions.go

@@ -25,6 +25,12 @@ import (
 // warning that the API server returns when a finalizer is not domain-qualified.
 func DomainQualifiedFinalizerWarning(domain string) regexp.Regexp {
 	return *regexp.MustCompile(
-		fmt.Sprintf("^metadata.finalizers:.*%s.*prefer a domain-qualified finalizer name to avoid accidental conflicts with other finalizer writers$", domain),
+		fmt.Sprintf("^metadata.finalizers:.*%s.*prefer a domain-qualified finalizer name (including a path \\(\\/\\) )?to avoid accidental conflicts with other finalizer writers$", domain),
 	)
 }
+
+// DeprecationWarning is a regular expression that matches a
+// warning that the API server returns when using a type that is deprecated.
+func DeprecationWarning() regexp.Regexp {
+	return *regexp.MustCompile("^.*is deprecated; use .*$")
+}

util/apiwarnings/handler.go

@@ -61,6 +61,7 @@ func DefaultHandler(l logr.Logger) *DiscardMatchingHandler {
 		Logger: l,
 		Expressions: []regexp.Regexp{
 			DomainQualifiedFinalizerWarning(clusterv1.GroupVersion.Group),
+			DeprecationWarning(),
 		},
 	}
 }

util/apiwarnings/handler_test.go

@@ -110,11 +110,23 @@ func TestDefaultHandler(t *testing.T) {
 			wantLogged: true,
 		},
 		{
-			name:       "do not log, if warning matches at least one expression",
+			name:       "do not log, if warning matches at least one expression (domain-qualified finalizer)",
 			code:       299,
 			message:    `metadata.finalizers: "dockermachine.infrastructure.cluster.x-k8s.io": prefer a domain-qualified finalizer name to avoid accidental conflicts with other finalizer writers`,
 			wantLogged: false,
 		},
+		{
+			name:       "do not log, if warning matches at least one expression (domain-qualified finalizer)",
+			code:       299,
+			message:    `metadata.finalizers: "cluster.cluster.x-k8s.io": prefer a domain-qualified finalizer name including a path (/) to avoid accidental conflicts with other finalizer writers`,
+			wantLogged: false,
+		},
+		{
+			name:       "do not log, if warning matches at least one expression (deprecation warning)",
+			code:       299,
+			message:    `controlplane.cluster.x-k8s.io/v1beta1 KubeadmControlPlane is deprecated; use controlplane.cluster.x-k8s.io/v1beta2 KubeadmControlPlane`,
+			wantLogged: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {