How can you measure the site (the result of the work)?

Question

Programming

This is exactly the question I was asked at one of the interviews, and in fact I fell into a stupor, I, of course, roughly understand what the Director of the office wants from me (who doesn’t know much about the web in general), but I couldn’t formulate the answer normally.
What do you think about this?
approx. dialogue:
- ... the result of your work is a ready site. And how can this be measured?

Answer 1

I would answer: Imagine that you are a carpenter, the result of your work is a finished sofa, but how can this be measured?

Answer 2

the first thing that came to mind was a speedtest from Google
and before and after

Answer 3

usually leads are meant,
everything else can be measured on wix.com to the point of numbness and a measuring tool will be better