code: func (g *Cloud) InstanceExistsByProviderID(ctx context.Context, providerID string) (bool, error) {
  	_, err := g.instanceByProviderID(providerID)
  	if err != nil {
  		if err == cloudprovider.InstanceNotFound {
  			return false, nil
  		}
  		return false, err
  	}
  
  	return true, nil
  }
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.