Deduplicate alerts with multiple receivers when viewing All receivers

[comicmuse]

My alerts go to multiple receivers. In 0.18.0, when I look at the default landing page on the alertmanager, with grouping on, I see a group for each receiver (though the receiver is not actually on the user interface).

I would expect only to see one instance of each alert when viewing All receivers.

[simonpasquier]

Thanks for reporting! It looks very similar to #1959 and #1875.

[simonpasquier]

For completeness, could you share your AlertManager configuration?

[comicmuse]

Yeah, definitely looks like #1875 . Sorry - I should have found that one.

Redacted alertmanager.yml attached.
alertmanager.txt

[comicmuse]

BTW, the reason I determined it was related to recievers was when I explicitly choose a Receiver from the dropdown, I no longer see the duplicates. (also ticking "Enable Custom Groups" removes the duplicates, for some reason)

[simonpasquier]

I'm closing it for now as we can follow up on the other issues.

ticking "Enable Custom Groups" removes the duplicates, for some reason

This is because it falls back to the pre-v0.18 view which calls /api/v2/alerts instead of /api/v2/alerts/groups. The latter is buggy when you have routes that group on the same set of label names.