How to calculate traffic revenue?

Question

Computer networks

Good day!
There is such a problem.
The site (forum) is hosted by VPS at firstvds in Moscow. The main audience in RU. For some time, several users have written to the mail of the webmaster with a complaint that the site does not open due to a timeout. The server is not loaded.
After correspondence with users (they sent screenshots), it turned out that their site really does not open and does not even respond. What they have in common is that they all use Rostelecom as a provider.
If you check the availability of the site on ping-admin & hosttracker, then the availability is 100%, but they do not show from which channels the check is being made.
I have a suspicion of a crooked routing between some Rostelecom subnets and the site's subnet. And since Rostelecom is not the latest provider, you don’t want to lose visitors out of the blue. Hoster support is frozen.
Actually, the question is how to make sure that the traffic is lost / not lost due to the inaccessibility of the site through this provider? And how much is lost?
So far, I’ve only thought of adding an ip from a different subnet to the VPS and giving both addresses via dns and then comparing the nginx logs for a few days to which ip receives more traffic. Is this correct? Or if dns (on reg.ru) will give ip unevenly, then the conclusions will not be correct?
How to do an unambiguous check? Or maybe look at it from a different perspective?

Answer 1

How did you ping? By name or IP address? If by name - did the name resolve? Or did it not respond because the site name did not resolve?
How is the tracing from problem clients to the site going?

Answer 2

Try to look from different countries: tools.pingdom.com/fpt