func (c *CoreDNS) list(key string, domain bool) ([]SrvRecord, error) {
	ctx, cancel := context.WithTimeout(context.Background(), defaultContextTimeout)
	r, err := c.etcdClient.Get(ctx, key, clientv3.WithPrefix())
	defer cancel()
	if err != nil {
		return nil, err
	}

	if r.Count == 0 {
		key = strings.TrimSuffix(key, etcdPathSeparator)
		r, err = c.etcdClient.Get(ctx, key)
		if err != nil {