feature: add QPS Burst flags

cmd/options/options.go

@@ -43,6 +43,10 @@ type NodeProblemDetectorOptions struct {
 	ServerPort int
 	// ServerAddress is the address to bind the node problem detector server.
 	ServerAddress string
+	// QPS is the maximum QPS to the master from client.
+	QPS float64
+	// Burst is the maximum burst for throttle.
+	Burst int
 
 	// exporter options
 
@@ -125,6 +129,8 @@ func (npdo *NodeProblemDetectorOptions) AddFlags(fs *pflag.FlagSet) {
 		20257, "The port to bind the Prometheus scrape endpoint. Prometheus exporter is enabled by default at port 20257. Use 0 to disable.")
 	fs.StringVar(&npdo.PrometheusServerAddress, "prometheus-address",
 		"127.0.0.1", "The address to bind the Prometheus scrape endpoint.")
+	flag.Float64Var(&npdo.QPS, "kube-api-qps", 500, "Maximum QPS to use while talking with Kubernetes API")
+	flag.IntVar(&npdo.Burst, "kube-api-burst", 500, "Maximum burst for throttle while talking with Kubernetes API")
 	for _, exporterName := range exporters.GetExporterNames() {
 		exporterHandler := exporters.GetExporterHandlerOrDie(exporterName)
 		exporterHandler.Options.SetFlags(fs)

pkg/exporters/k8sexporter/problemclient/problem_client.go

@@ -74,7 +74,8 @@ func NewClientOrDie(npdo *options.NodeProblemDetectorOptions) Client {
 	}
 
 	cfg.UserAgent = fmt.Sprintf("%s/%s", filepath.Base(os.Args[0]), version.Version())
-	// TODO(random-liu): Set QPS Limit
+	cfg.QPS = float32(npdo.QPS)
+	cfg.Burst = npdo.Burst
 	c.client = clientset.NewForConfigOrDie(cfg).CoreV1()
 	c.nodeName = npdo.NodeName
 	c.eventNamespace = npdo.EventNamespace