code: func (os *OpenStack) Instances() (cloudprovider.Instances, bool) {
  	klog.V(4).Info("openstack.Instances() called")
  
  	compute, err := os.NewComputeV2()
  	if err != nil {
  		klog.Errorf("unable to access compute v2 API : %v", err)
  		return nil, false
  	}
  
  	klog.V(4).Info("Claiming to support Instances")
  
  	return &Instances{
  		compute: compute,
  		opts:    os.metadataOpts,
  	}, true
  }
docs: // Instances returns an implementation of Instances for OpenStack.