code: func (g *KubeVersionGetter) KubeadmVersion() (string, *versionutil.Version, error) {
  	kubeadmVersionInfo := version.Get()
  	fmt.Fprintf(g.w, "[upgrade/versions] kubeadm version: %s\n", kubeadmVersionInfo.String())
  
  	kubeadmVersion, err := versionutil.ParseSemantic(kubeadmVersionInfo.String())
  	if err != nil {
  		return "", nil, errors.Wrap(err, "Couldn't parse kubeadm version")
  	}
  	return kubeadmVersionInfo.String(), kubeadmVersion, nil
  }
docs: // KubeadmVersion gets kubeadm version