I am looking into upgrading to prometheus 3 and stumbled across an issue 
with the service discovery UI. For some scrape pools i get the error:

*Error:* Received target information for an unknown scrape pool, likely the 
list of scrape pools has changed. Please reload the page.

After digging around a bit in the java-script I suspect that the issue is 
caused by me setting a `job` label in file_sd configs breaking the `s[u]` 
lookup in this code since my custom job label is not a valid key.

```
    for (const c of n) {
        const {job: u} = c.discoveredLabels
          , d = s[u];
        if (!d)
            throw new Error("Received target information for an unknown 
scrape pool, likely the list of scrape pools has changed. Please reload the 
page.");
        d.total++
    }
    const o = i.length !==
```

Am I correct with this? If so, is there any way I can use a custom `job` 
label or is that something that should not be done?

Cheers
Christoph

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