Converting klog.Fatalf to structured logging equivalent

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

@@ -85,7 +85,8 @@ func main() {
 	klog.V(1).InfoS("Starting Vertical Pod Autoscaler Admission Controller", "version", common.VerticalPodAutoscalerVersion)
 
 	if len(commonFlags.VpaObjectNamespace) > 0 && len(commonFlags.IgnoredVpaObjectNamespaces) > 0 {
-		klog.Fatalf("--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		klog.ErrorS(nil, "--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		os.Exit(255)
 	}
 
 	healthCheck := metrics.NewHealthCheck(time.Minute)
@@ -113,7 +114,8 @@ func main() {
 
 	hostname, err := os.Hostname()
 	if err != nil {
-		klog.Fatalf("Unable to get hostname: %v", err)
+		klog.ErrorS(err, "Unable to get hostname")
+		os.Exit(255)
 	}
 
 	statusNamespace := status.AdmissionControllerStatusNamespace
@@ -151,6 +153,7 @@ func main() {
 	}()
 
 	if err = server.ListenAndServeTLS("", ""); err != nil {
-		klog.Fatalf("HTTPS Error: %s", err)
+		klog.ErrorS(err, "Failed to start HTTPS server")
+		os.Exit(255)
 	}
 }

vertical-pod-autoscaler/pkg/recommender/input/metrics/metrics_source.go

@@ -18,6 +18,7 @@ package metrics
 
 import (
 	"context"
+	"os"
 	"time"
 
 	k8sapiv1 "k8s.io/api/core/v1"
@@ -70,7 +71,8 @@ type ExternalClientOptions struct {
 func NewExternalClient(c *rest.Config, clusterState *model.ClusterState, options ExternalClientOptions) PodMetricsLister {
 	extClient, err := external_metrics.NewForConfig(c)
 	if err != nil {
-		klog.Fatalf("Failed initializing external metrics client: %v", err)
+		klog.ErrorS(err, "Failed initializing external metrics client")
+		os.Exit(255)
 	}
 	return &externalMetricsClient{
 		externalClient: extClient,

vertical-pod-autoscaler/pkg/recommender/main.go

@@ -127,7 +127,8 @@ func main() {
 	klog.V(1).InfoS("Vertical Pod Autoscaler Recommender", "version", common.VerticalPodAutoscalerVersion, "recommenderName", *recommenderName)
 
 	if len(commonFlags.VpaObjectNamespace) > 0 && len(commonFlags.IgnoredVpaObjectNamespaces) > 0 {
-		klog.Fatalf("--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		klog.ErrorS(nil, "--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		os.Exit(255)
 	}
 
 	healthCheck := metrics.NewHealthCheck(*metricsFetcherInterval * 5)
@@ -140,7 +141,8 @@ func main() {
 	} else {
 		id, err := os.Hostname()
 		if err != nil {
-			klog.Fatalf("Unable to get hostname: %v", err)
+			klog.ErrorS(err, "Unable to get hostname")
+			os.Exit(255)
 		}
 		id = id + "_" + string(uuid.NewUUID())
 
@@ -158,7 +160,8 @@ func main() {
 			},
 		)
 		if err != nil {
-			klog.Fatalf("Unable to create leader election lock: %v", err)
+			klog.ErrorS(err, "Unable to create leader election lock")
+			os.Exit(255)
 		}
 
 		leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
@@ -266,7 +269,8 @@ func run(healthCheck *metrics.HealthCheck, commonFlag *common.CommonFlags) {
 
 	promQueryTimeout, err := time.ParseDuration(*queryTimeout)
 	if err != nil {
-		klog.Fatalf("Could not parse --prometheus-query-timeout as a time.Duration: %v", err)
+		klog.ErrorS(err, "Could not parse --prometheus-query-timeout as a time.Duration")
+		os.Exit(255)
 	}
 
 	if useCheckpoints {
@@ -293,7 +297,8 @@ func run(healthCheck *metrics.HealthCheck, commonFlag *common.CommonFlags) {
 		}
 		provider, err := history.NewPrometheusHistoryProvider(config)
 		if err != nil {
-			klog.Fatalf("Could not initialize history provider: %v", err)
+			klog.ErrorS(err, "Could not initialize history provider")
+			os.Exit(255)
 		}
 		recommender.GetClusterStateFeeder().InitFromHistoryProvider(provider)
 	}

vertical-pod-autoscaler/pkg/recommender/model/cluster_test.go

@@ -19,6 +19,7 @@ package model
 import (
 	"context"
 	"fmt"
+	"os"
 	"testing"
 	"time"
 
@@ -354,7 +355,8 @@ func addVpaObject(cluster *ClusterState, id VpaID, vpa *vpa_types.VerticalPodAut
 	parsedSelector, _ := metav1.LabelSelectorAsSelector(labelSelector)
 	err := cluster.AddOrUpdateVpa(vpa, parsedSelector)
 	if err != nil {
-		klog.Fatalf("AddOrUpdateVpa() failed: %v", err)
+		klog.ErrorS(err, "AddOrUpdateVpa() failed")
+		os.Exit(255)
 	}
 	return cluster.Vpas[id]
 }

vertical-pod-autoscaler/pkg/target/controller_fetcher/controller_fetcher.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"os"
 	"time"
 
 	appsv1 "k8s.io/api/apps/v1"
@@ -115,7 +116,8 @@ func (f *controllerFetcher) Start(ctx context.Context, loopPeriod time.Duration)
 func NewControllerFetcher(config *rest.Config, kubeClient kube_client.Interface, factory informers.SharedInformerFactory, betweenRefreshes, lifeTime time.Duration, jitterFactor float64) *controllerFetcher {
 	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
 	if err != nil {
-		klog.Fatalf("Could not create discoveryClient: %v", err)
+		klog.ErrorS(err, "Could not create discoveryClient")
+		os.Exit(255)
 	}
 	resolver := scale.NewDiscoveryScaleKindResolver(discoveryClient)
 	restClient := kubeClient.CoreV1().RESTClient()

vertical-pod-autoscaler/pkg/target/fetcher.go

@@ -19,6 +19,7 @@ package target
 import (
 	"context"
 	"fmt"
+	"os"
 	"time"
 
 	appsv1 "k8s.io/api/apps/v1"
@@ -69,7 +70,8 @@ const (
 func NewVpaTargetSelectorFetcher(config *rest.Config, kubeClient kube_client.Interface, factory informers.SharedInformerFactory) VpaTargetSelectorFetcher {
 	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
 	if err != nil {
-		klog.Fatalf("Could not create discoveryClient: %v", err)
+		klog.ErrorS(err, "Could not create discoveryClient")
+		os.Exit(255)
 	}
 	resolver := scale.NewDiscoveryScaleKindResolver(discoveryClient)
 	restClient := kubeClient.CoreV1().RESTClient()
@@ -94,7 +96,8 @@ func NewVpaTargetSelectorFetcher(config *rest.Config, kubeClient kube_client.Int
 		go informer.Run(stopCh)
 		synced := cache.WaitForCacheSync(stopCh, informer.HasSynced)
 		if !synced {
-			klog.Fatalf("Could not sync cache for %s: %v", kind, err)
+			klog.ErrorS(nil, "Could not sync cache for "+string(kind))
+			os.Exit(255)
 		} else {
 			klog.InfoS("Initial sync completed", "kind", kind)
 		}

vertical-pod-autoscaler/pkg/updater/logic/updater.go

@@ -19,6 +19,7 @@ package logic
 import (
 	"context"
 	"fmt"
+	"os"
 	"slices"
 	"time"
 
@@ -135,7 +136,8 @@ func (u *updater) RunOnce(ctx context.Context) {
 
 	vpaList, err := u.vpaLister.List(labels.Everything())
 	if err != nil {
-		klog.Fatalf("failed get VPA list: %v", err)
+		klog.ErrorS(err, "Failed to get VPA list")
+		os.Exit(255)
 	}
 	timer.ObserveStep("ListVPAs")
 
@@ -318,7 +320,8 @@ func newEventRecorder(kubeClient kube_client.Interface) record.EventRecorder {
 
 	vpascheme := scheme.Scheme
 	if err := corescheme.AddToScheme(vpascheme); err != nil {
-		klog.Fatalf("Error adding core scheme: %v", err)
+		klog.ErrorS(err, "Error adding core scheme")
+		os.Exit(255)
 	}
 
 	return eventBroadcaster.NewRecorder(vpascheme, apiv1.EventSource{Component: "vpa-updater"})

vertical-pod-autoscaler/pkg/updater/main.go

@@ -92,7 +92,8 @@ func main() {
 	klog.V(1).InfoS("Vertical Pod Autoscaler Updater", "version", common.VerticalPodAutoscalerVersion)
 
 	if len(commonFlags.VpaObjectNamespace) > 0 && len(commonFlags.IgnoredVpaObjectNamespaces) > 0 {
-		klog.Fatalf("--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		klog.ErrorS(nil, "--vpa-object-namespace and --ignored-vpa-object-namespaces are mutually exclusive and can't be set together.")
+		os.Exit(255)
 	}
 
 	healthCheck := metrics.NewHealthCheck(*updaterInterval * 5)
@@ -105,7 +106,8 @@ func main() {
 	} else {
 		id, err := os.Hostname()
 		if err != nil {
-			klog.Fatalf("Unable to get hostname: %v", err)
+			klog.ErrorS(err, "Unable to get hostname")
+			os.Exit(255)
 		}
 		id = id + "_" + string(uuid.NewUUID())
 
@@ -123,7 +125,8 @@ func main() {
 			},
 		)
 		if err != nil {
-			klog.Fatalf("Unable to create leader election lock: %v", err)
+			klog.ErrorS(err, "Unable to create leader election lock")
+			os.Exit(255)
 		}
 
 		leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
@@ -201,7 +204,8 @@ func run(healthCheck *metrics.HealthCheck, commonFlag *common.CommonFlags) {
 		ignoredNamespaces,
 	)
 	if err != nil {
-		klog.Fatalf("Failed to create updater: %v", err)
+		klog.ErrorS(err, "Failed to create updater")
+		os.Exit(255)
 	}
 
 	// Start updating health check endpoint.

vertical-pod-autoscaler/pkg/utils/metrics/healthcheck.go

@@ -19,6 +19,7 @@ package metrics
 import (
 	"fmt"
 	"net/http"
+	"os"
 	"sync"
 	"time"
 
@@ -75,7 +76,8 @@ func (hc *HealthCheck) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(200)
 		_, err := w.Write([]byte("OK"))
 		if err != nil {
-			klog.Fatalf("Failed to write response message: %v", err)
+			klog.ErrorS(err, "Failed to write response message")
+			os.Exit(255)
 		}
 	}
 }

vertical-pod-autoscaler/pkg/utils/server/server.go

@@ -20,6 +20,7 @@ package server
 import (
 	"net/http"
 	"net/http/pprof"
+	"os"
 
 	"k8s.io/klog/v2"
 
@@ -46,6 +47,7 @@ func Initialize(enableProfiling *bool, healthCheck *metrics.HealthCheck, address
 		}
 
 		err := http.ListenAndServe(*address, mux)
-		klog.Fatalf("Failed to start metrics: %v", err)
+		klog.ErrorS(err, "Failed to start metrics")
+		os.Exit(255)
 	}()
 }