code: func (o *CSRSigningControllerOptions) AddFlags(fs *pflag.FlagSet) {
  	if o == nil {
  		return
  	}
  
  	fs.StringVar(&o.ClusterSigningCertFile, "cluster-signing-cert-file", o.ClusterSigningCertFile, "Filename containing a PEM-encoded X509 CA certificate used to issue cluster-scoped certificates")
  	fs.StringVar(&o.ClusterSigningKeyFile, "cluster-signing-key-file", o.ClusterSigningKeyFile, "Filename containing a PEM-encoded RSA or ECDSA private key used to sign cluster-scoped certificates")
  	fs.DurationVar(&o.ClusterSigningDuration.Duration, "experimental-cluster-signing-duration", o.ClusterSigningDuration.Duration, "The length of duration signed certificates will be given.")
  }
docs: // AddFlags adds flags related to CSRSigningController for controller manager to the specified FlagSet.