fix: raise default --kube-api-qps/--kube-api-burst to 50/100

The previous defaults (QPS=20, Burst=30) cause client-side throttling
with as few as 100 ScaledObjects, adding ~5s delay per status PATCH and
making scale-to-zero take 15-20 minutes instead of ~5.5 minutes.

Raise all three components (operator, metrics adapter, webhooks) to
QPS=50 / Burst=100 to match what other large-scale controllers use
(e.g. ArgoCD 50/100) while remaining well below API server capacity.

Relates to #7613

Signed-off-by: Mikhail Fedosin <mfedosin@redhat.com>

Author: Fedosin

cmd/adapter/main.go

@@ -238,8 +238,8 @@ func main() {
 	cmd.Flags().StringVar(&metricsServiceAddr, "metrics-service-address", generateDefaultMetricsServiceAddr(), "The address of the GRPC Metrics Service Server.")
 	cmd.Flags().StringVar(&metricsServiceGRPCAuthority, "metrics-service-grpc-authority", "", "Host Authority override for the Metrics Service if the Host Authority is not the same as the address used for the GRPC Metrics Service Server.")
 	cmd.Flags().StringVar(&profilingAddr, "profiling-bind-address", "", "The address the profiling would be exposed on.")
-	cmd.Flags().Float32Var(&adapterClientRequestQPS, "kube-api-qps", 20.0, "Set the QPS rate for throttling requests sent to the apiserver")
-	cmd.Flags().IntVar(&adapterClientRequestBurst, "kube-api-burst", 30, "Set the burst for throttling requests sent to the apiserver")
+	cmd.Flags().Float32Var(&adapterClientRequestQPS, "kube-api-qps", 50.0, "Set the QPS rate for throttling requests sent to the apiserver")
+	cmd.Flags().IntVar(&adapterClientRequestBurst, "kube-api-burst", 100, "Set the burst for throttling requests sent to the apiserver")
 	cmd.Flags().BoolVar(&disableCompression, "disable-compression", true, "Disable response compression for k8s restAPI in client-go. ")
 
 	// legacy klogr flags handled for backwards compatibility. Default set to -1 so it doesn't override values set via zap options

cmd/operator/main.go

@@ -100,8 +100,8 @@ func main() {
 		"Enable leader election for controller manager. "+
 			"Enabling this will ensure there is only one active controller manager.")
 	pflag.StringVar(&leaderElectionID, "leader-election-id", "operator.keda.sh", "Leader election ID for the controller manager. Defaults to operator.keda.sh")
-	pflag.Float32Var(&adapterClientRequestQPS, "kube-api-qps", 20.0, "Set the QPS rate for throttling requests sent to the apiserver")
-	pflag.IntVar(&adapterClientRequestBurst, "kube-api-burst", 30, "Set the burst for throttling requests sent to the apiserver")
+	pflag.Float32Var(&adapterClientRequestQPS, "kube-api-qps", 50.0, "Set the QPS rate for throttling requests sent to the apiserver")
+	pflag.IntVar(&adapterClientRequestBurst, "kube-api-burst", 100, "Set the burst for throttling requests sent to the apiserver")
 	pflag.BoolVar(&disableCompression, "disable-compression", true, "Disable response compression for k8s restAPI in client-go. ")
 	pflag.StringVar(&certSecretName, "cert-secret-name", "kedaorg-certs", "KEDA certificates secret name. Defaults to kedaorg-certs")
 	pflag.StringVar(&certDir, "cert-dir", "/certs", "Webhook certificates dir to use. Defaults to /certs")

cmd/webhooks/main.go

@@ -65,8 +65,8 @@ func main() {
 	pflag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
 	pflag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	pflag.StringVar(&profilingAddr, "profiling-bind-address", "", "The address the profiling would be exposed on.")
-	pflag.Float32Var(&webhooksClientRequestQPS, "kube-api-qps", 20.0, "Set the QPS rate for throttling requests sent to the apiserver")
-	pflag.IntVar(&webhooksClientRequestBurst, "kube-api-burst", 30, "Set the burst for throttling requests sent to the apiserver")
+	pflag.Float32Var(&webhooksClientRequestQPS, "kube-api-qps", 50.0, "Set the QPS rate for throttling requests sent to the apiserver")
+	pflag.IntVar(&webhooksClientRequestBurst, "kube-api-burst", 100, "Set the burst for throttling requests sent to the apiserver")
 	pflag.StringVar(&certDir, "cert-dir", "/certs", "Webhook certificates dir to use. Defaults to /certs")
 	pflag.IntVar(&webhooksPort, "port", 9443, "Port number to serve webhooks. Defaults to 9443")
 	pflag.BoolVar(&cacheMissToDirectClient, "cache-miss-to-direct-client", false, "If true, on cache misses the webhook will call the direct client to fetch the object")