switch c.Type {
	case storagebackend.StorageTypeETCD2:
		return nil, fmt.Errorf("%s is no longer a supported storage backend", c.Type)
	case storagebackend.StorageTypeUnset, storagebackend.StorageTypeETCD3:
		return newETCD3ReadyCheck(c, stopCh)
	default:
		return nil, fmt.Errorf("unknown storage type: %s", c.Type)
	}
}

func CreateProber(c storagebackend.Config) (Prober, error) {
	switch c.Type {
	case storagebackend.StorageTypeETCD2:

	timeout := storagebackend.DefaultHealthcheckTimeout
	if c.HealthcheckTimeout != time.Duration(0) {
		timeout = c.HealthcheckTimeout
	}
	return newETCD3Check(c, timeout, stopCh)
}

func newETCD3ReadyCheck(c storagebackend.Config, stopCh <-chan struct{}) (func() error, error) {
	timeout := storagebackend.DefaultReadinessTimeout
	if c.ReadycheckTimeout != time.Duration(0) {
		timeout = c.ReadycheckTimeout
	}