alertmanager add Mattermost integration

#1512 Here is Mattermost notifier. It supports Mattermost Webhooks according specs. https://developers.mattermost.com/integrate/webhooks/incoming/

Tests and lints are passed.

Nov 01 '24 09:11 UndeadDemidov

@SuperQ done with migrating to slog

Nov 27 '24 14:11 UndeadDemidov

Hi @SuperQ, it would be helpful, if we can use this feature.

Mar 05 '25 22:03 vertrost

:eyeglasses: @grobinson-grafana

Mar 06 '25 10:03 SuperQ

👓 @grobinson-grafana

Taking a look! 👀

Mar 06 '25 10:03 grobinson-grafana

Hey @grobinson-grafana - could this be merged or is there anything else blocking it? I would really appreciate this feature

Jun 05 '25 14:06 fzakfeld

+1 on this being a great addition. Would love to utilize it :) Thanks for the implementation 🙇🏾

Jul 21 '25 19:07 linusfr

Hello ! Thanks everyone for the great work you do and @UndeadDemidov for writing this PR ! I see that alertmanager 0.29.0 first release candidate is out. Is it possible to add this PR in this 0.29.0 release ? It seems like nothing is blocking (reviewer @SuperQ approved, all checks have passed, no conflicts with base branch). It would be really nice to be able to use alertmanager cleanly with Mattermost without hacks.

Oct 13 '25 21:10 larueli

+1 waiting on this too

Oct 17 '25 20:10 filiprupic

+1

Nov 01 '25 09:11 venom13k

+1

Nov 03 '25 14:11 danilo-patrucco