Merge pull request #5787 from yanfeng1992/descheduler-leader

 Introduced descheduler leaderElection options including: `--leader-elect-lease-duration`, `--leader-elect-renew-deadline`, `--leader-elect-retry-period`,

cmd/descheduler/app/options/options.go

@@ -105,6 +105,19 @@ func (o *Options) AddFlags(fs *pflag.FlagSet) {
 	}
 	fs.BoolVar(&o.LeaderElection.LeaderElect, "leader-elect", true, "Enable leader election, which must be true when running multi instances.")
 	fs.StringVar(&o.LeaderElection.ResourceNamespace, "leader-elect-resource-namespace", util.NamespaceKarmadaSystem, "The namespace of resource object that is used for locking during leader election.")
+	fs.DurationVar(&o.LeaderElection.LeaseDuration.Duration, "leader-elect-lease-duration", defaultElectionLeaseDuration.Duration, ""+
+		"The duration that non-leader candidates will wait after observing a leadership "+
+		"renewal until attempting to acquire leadership of a led but unrenewed leader "+
+		"slot. This is effectively the maximum duration that a leader can be stopped "+
+		"before it is replaced by another candidate. This is only applicable if leader "+
+		"election is enabled.")
+	fs.DurationVar(&o.LeaderElection.RenewDeadline.Duration, "leader-elect-renew-deadline", defaultElectionRenewDeadline.Duration, ""+
+		"The interval between attempts by the acting master to renew a leadership slot "+
+		"before it stops leading. This must be less than or equal to the lease duration. "+
+		"This is only applicable if leader election is enabled.")
+	fs.DurationVar(&o.LeaderElection.RetryPeriod.Duration, "leader-elect-retry-period", defaultElectionRetryPeriod.Duration, ""+
+		"The duration the clients should wait between attempting acquisition and renewal "+
+		"of a leadership. This is only applicable if leader election is enabled.")
 	fs.StringVar(&o.KubeConfig, "kubeconfig", o.KubeConfig, "Path to karmada control plane kubeconfig file.")
 	fs.StringVar(&o.Master, "master", o.Master, "The address of the Kubernetes API server. Overrides any value in KubeConfig. Only required if out-of-cluster.")
 	fs.Float32Var(&o.KubeAPIQPS, "kube-api-qps", 40.0, "QPS to use while talking with karmada-apiserver.")