code: func (v *Cloud) InstanceExistsByProviderID(ctx context.Context, providerID string) (bool, error) {
  	return false, cloudprovider.NotImplemented
  }
docs: // InstanceExistsByProviderID returns true if the instance with the given provider id still exists and is running.
  // If false is returned with no error, the instance will be immediately deleted by the cloud controller manager.