How can you quickly test goals in Yandex metrics?

Question

Yandex.Metrica

Hello!

A question.
There are several subdomains of the site (for each city).
Recently, a programmer was asked to set goals for a site for one domain.
Do I understand correctly that if a person places an order from one city, then the target will be pulled up in this city?
Is it possible to somehow quickly check the success of the goal for the site in terms of correctness?
It's just that there are doubts about the fact that in some subdomain the goal will not work at all.
And on some subdomain, the goal will double (for example, it will work simultaneously on one city and on another)?

How do marketers act in this case if there are, for example, not 20, but 400 subdomains for each region?

Answer 1

There is an option through the console and ym_debug=1 :
https://yandex.ru/support/metrica/general/check-go...