func (o *otelclient) DoMulti(ctx context.Context, multi ...rueidis.Completed) (resp []rueidis.RedisResult) {
    ctx, span := o.start(ctx, multiFirst(multi), multiSum(multi), o.tAttrs)
    resp = o.client.DoMulti(ctx, multi...)
    o.end(span, firstError(resp))
    return