duplicate alert groups returned by api

[stuartnelson3]

What did you do?

view the alert list page via the ui

What did you expect to see?

non-duplicated alert groups

What did you see instead? Under which circumstances?

some alert groups are duplicated. i'm not sure why yet.

Environment

• System information:

  insert output of uname -srm here

• Alertmanager version:

  0.17.0

Of the 110 currently active alert groups at soundcloud, only 2 of the groups are duplicated (for a total of 4 groups being returned from the api, when only 2 of them should be). The groups appear to be perfectly duplicated.

[stuartnelson3]

This might be an artifact of that particular group's configuration. It only affects a single team. I'm thinking there might be some race condition in creating the groups internal to alertmanager when the routes are configured in a certain way. This would also explain why they have been seeing duplicate messages.

[taisph]

We currently see a duplicated alert in the UI with 0.17.0 but not with amtool alert query. Clicking "+ Info" on either expands both alerts in the UI. Not sure if it is the same issue.

[psalaberria002]

I also see duplicate groups. Version 0.18.

[simonpasquier]

I can reproduce as well. It happens when I configure routes with the same group_by and continue: true. I'll dig into it...

[simonpasquier]

#1964 has fixed the problem on the API v2 side but there's still a glitch in the UI: when several groups have the same grouping labels, clicking on the +/- button will expand/collapse all of them.

[simonpasquier]

Closed by #2012 and #1964