Dashboard for PQ about pq HOT 3 OPEN

@malthe thanks for the tip - here's a screenshot:

Re. who's listening - cheers, you've saved me time trying to find a workaround. I think more heavyweight solutions are possible but not really in keeping with the unopinionated spirit of pq. 👍

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Hi Tom. Looks great – how about a screenshot? You can just drag any PNG into a Markdown field on Github and it'll upload an image.

For who's listening, that's a tricky one because even if there was a way to query that in PostgreSQL it would probably require superuser permission.

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@MisterKeefe I suppose we could send a notification the other way – as a sort of health probe – such that every N seconds, each worker would send a notification that it's listening and the dashboard could pick that up if it subscribed to them using its own listener.

But at some point, you're probably better off using a proper monitoring system, e.g. https://prometheus.io/.

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