code: func (a *AuthWithRoles) GetClusterConfig(opts ...services.MarshalOption) (services.ClusterConfig, error) {
  	if err := a.action(defaults.Namespace, services.KindClusterConfig, services.VerbRead); err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return a.authServer.GetClusterConfig(opts...)
  }
docs: // GetClusterConfig gets cluster level configuration.