Wrong URL to the prometheus (Alert source links)

I think it's this part:

       <h6 className="dropdown-header">Alert source links:</h6>
        {alert.alertmanager.map((am) => (
          <MenuLink
            key={am.name}
            icon={faExternalLinkAlt}
            text={am.name}
            uri={am.source}
            afterClick={afterClick}
          />
        ))}

So looks like am.source is wrong. This data is coming from the alert-manager?

It comes from alertmanager.
Sounds like you need to configure --web.external-url

See https://www.robustperception.io/using-external-urls-and-proxies-with-prometheus

Thanks for the answer. I think that's not the issue. I see that I have --web.external-url specified in every single alert-manager deployment. I also noticed that for some alerts I see it correct and for most I see some random string. I have no idea what's the difference between them. I'm trying to figure it out.

I found the problem. Some of my alerts were from the other Prometheus instance (but by mistake they had wrong cluster-name and ID in the alert spec). This is why I was thinking alerts are coming from the proper Prometheus server. The other one had no --web.external-url like @prymitive said. Thanks! I'm closing it.