Refactor logging statements in admission controller

vertical-pod-autoscaler/pkg/admission-controller/certs.go

@@ -34,11 +34,10 @@ type certsConfig struct {
 func readFile(filePath string) []byte {
 	res, err := os.ReadFile(filePath)
 	if err != nil {
-		klog.Errorf("Error reading certificate file at %s: %v", filePath, err)
+		klog.ErrorS(err, "Error reading certificate file", "file", filePath)
 		return nil
 	}
-
-	klog.V(3).Infof("Successfully read %d bytes from %v", len(res), filePath)
+	klog.V(3).InfoS("Successfully read bytes from file", "bytes", len(res), "file", filePath)
 	return res
 }
 
@@ -67,9 +66,9 @@ func (cr *certReloader) start(stop <-chan struct{}) error {
 			select {
 			case event := <-watcher.Events:
 				if event.Has(fsnotify.Create) || event.Has(fsnotify.Write) {
-					klog.V(2).Info("New certificate found, reloading")
+					klog.V(2).InfoS("New certificate found, reloading")
 					if err := cr.load(); err != nil {
-						klog.Errorf("Failed to reload certificate: %s", err)
+						klog.ErrorS(err, "Failed to reload certificate")
 					}
 				}
 			case err := <-watcher.Errors:

vertical-pod-autoscaler/pkg/admission-controller/main.go

@@ -108,7 +108,7 @@ func main() {
 	var limitRangeCalculator limitrange.LimitRangeCalculator
 	limitRangeCalculator, err := limitrange.NewLimitsRangeCalculator(factory)
 	if err != nil {
-		klog.Errorf("Failed to create limitRangeCalculator, falling back to not checking limits. Error message: %s", err)
+		klog.ErrorS(err, "Failed to create limitRangeCalculator, falling back to not checking limits.")
 		limitRangeCalculator = limitrange.NewNoopLimitsCalculator()
 	}
 	recommendationProvider := recommendation.NewProvider(limitRangeCalculator, vpa_api_util.NewCappingRecommendationProcessor(limitRangeCalculator))

vertical-pod-autoscaler/pkg/admission-controller/resource/pod/handler.go

@@ -77,10 +77,10 @@ func (h *resourceHandler) GetPatches(ctx context.Context, ar *admissionv1.Admiss
 		pod.Name = pod.GenerateName + "%"
 		pod.Namespace = namespace
 	}
-	klog.V(4).Infof("Admitting pod %s", klog.KObj(&pod))
+	klog.V(4).InfoS("Admitting pod", "pod", klog.KObj(&pod))
 	controllingVpa := h.vpaMatcher.GetMatchingVPA(ctx, &pod)
 	if controllingVpa == nil {
-		klog.V(4).Infof("No matching VPA found for pod %s", klog.KObj(&pod))
+		klog.V(4).InfoS("No matching VPA found for pod", "pod", klog.KObj(&pod))
 		return []resource_admission.PatchRecord{}, nil
 	}
 	pod, err := h.preProcessor.Process(pod)

vertical-pod-autoscaler/pkg/admission-controller/resource/pod/recommendation/recommendation_provider.go

@@ -56,10 +56,10 @@ func GetContainersResources(pod *core.Pod, vpaResourcePolicy *vpa_types.PodResou
 		recommendation := vpa_api_util.GetRecommendationForContainer(container.Name, &podRecommendation)
 		if recommendation == nil {
 			if !addAll {
-				klog.V(2).Infof("no matching recommendation found for container %s, skipping", container.Name)
+				klog.V(2).InfoS("No recommendation found for container, skipping", "container", container.Name)
 				continue
 			}
-			klog.V(2).Infof("no matching recommendation found for container %s, using Pod request", container.Name)
+			klog.V(2).InfoS("No match found for container, using Pod request", "container", container.Name)
 			resources[i].Requests = container.Resources.Requests
 		} else {
 			resources[i].Requests = recommendation.Target
@@ -106,10 +106,10 @@ func GetContainersResources(pod *core.Pod, vpaResourcePolicy *vpa_types.PodResou
 // The returned slice corresponds 1-1 to containers in the Pod.
 func (p *recommendationProvider) GetContainersResourcesForPod(pod *core.Pod, vpa *vpa_types.VerticalPodAutoscaler) ([]vpa_api_util.ContainerResources, vpa_api_util.ContainerToAnnotationsMap, error) {
 	if vpa == nil || pod == nil {
-		klog.V(2).Infof("can't calculate recommendations, one of vpa(%+v), pod(%+v) is nil", vpa, pod)
+		klog.V(2).InfoS("Can't calculate recommendations, one of VPA or Pod is nil", "vpa", vpa, "pod", pod)
 		return nil, nil, nil
 	}
-	klog.V(2).Infof("updating requirements for pod %s.", pod.Name)
+	klog.V(2).InfoS("Updating requirements for pod", "pod", pod.Name)
 
 	var annotations vpa_api_util.ContainerToAnnotationsMap
 	recommendedPodResources := &vpa_types.RecommendedPodResources{}
@@ -118,7 +118,7 @@ func (p *recommendationProvider) GetContainersResourcesForPod(pod *core.Pod, vpa
 		var err error
 		recommendedPodResources, annotations, err = p.recommendationProcessor.Apply(vpa.Status.Recommendation, vpa.Spec.ResourcePolicy, vpa.Status.Conditions, pod)
 		if err != nil {
-			klog.V(2).Infof("cannot process recommendation for pod %s", klog.KObj(pod))
+			klog.V(2).InfoS("Cannot process recommendation for pod", "pod", klog.KObj(pod))
 			return nil, annotations, err
 		}
 	}
@@ -135,7 +135,7 @@ func (p *recommendationProvider) GetContainersResourcesForPod(pod *core.Pod, vpa
 	// Ensure that we are not propagating empty resource key if any.
 	for _, resource := range containerResources {
 		if resource.RemoveEmptyResourceKeyIfAny() {
-			klog.Infof("An empty resource key was found and purged for pod=%s with vpa=%s", klog.KObj(pod), klog.KObj(vpa))
+			klog.InfoS("An empty resource key was found and purged", "pod", klog.KObj(pod), "vpa", klog.KObj(vpa))
 		}
 	}
 

vertical-pod-autoscaler/pkg/admission-controller/resource/vpa/handler.go

@@ -89,7 +89,7 @@ func (h *resourceHandler) GetPatches(_ context.Context, ar *v1.AdmissionRequest)
 		return nil, err
 	}
 
-	klog.V(4).Infof("Processing vpa: %v", vpa)
+	klog.V(4).InfoS("Processing vpa", "vpa", vpa)
 	patches := []resource.PatchRecord{}
 	if vpa.Spec.UpdatePolicy == nil {
 		// Sets the default updatePolicy.

vertical-pod-autoscaler/pkg/admission-controller/resource/vpa/matcher.go

@@ -54,7 +54,7 @@ func NewMatcher(vpaLister vpa_lister.VerticalPodAutoscalerLister,
 func (m *matcher) GetMatchingVPA(ctx context.Context, pod *core.Pod) *vpa_types.VerticalPodAutoscaler {
 	configs, err := m.vpaLister.VerticalPodAutoscalers(pod.Namespace).List(labels.Everything())
 	if err != nil {
-		klog.Errorf("failed to get vpa configs: %v", err)
+		klog.ErrorS(err, "Failed to get vpa configs")
 		return nil
 	}
 	onConfigs := make([]*vpa_api_util.VpaWithSelector, 0)
@@ -64,15 +64,15 @@ func (m *matcher) GetMatchingVPA(ctx context.Context, pod *core.Pod) *vpa_types.
 		}
 		selector, err := m.selectorFetcher.Fetch(ctx, vpaConfig)
 		if err != nil {
-			klog.V(3).Infof("skipping VPA object %s because we cannot fetch selector: %s", klog.KObj(vpaConfig), err)
+			klog.V(3).InfoS("Skipping VPA object because we cannot fetch selector", "vpa", klog.KObj(vpaConfig), "error", err)
 			continue
 		}
 		onConfigs = append(onConfigs, &vpa_api_util.VpaWithSelector{
 			Vpa:      vpaConfig,
 			Selector: selector,
 		})
 	}
-	klog.V(2).Infof("Let's choose from %d configs for pod %s", len(onConfigs), klog.KObj(pod))
+	klog.V(2).InfoS("Let's choose from", "configs", len(onConfigs), "pod", klog.KObj(pod))
 	result := vpa_api_util.GetControllingVPAForPod(ctx, pod, onConfigs, m.controllerFetcher)
 	if result != nil {
 		return result.Vpa