Alertmanager: Implement Mattermost webhook

[mxinden]

As a user of the Prometheus Alertmanager I would like to send notifications to Mattermost via a webhook.

Examples on how to implement a webhook:

• https://prometheus.io/docs/alerting/configuration/#%3Cwebhook_config%3E
• https://www.robustperception.io/audio-alerting-with-prometheus
• https://github.com/prometheus/alertmanager/tree/master/examples/webhook

Originates from tweet.

@cpanato would you like to look into this? I am here to help.

[cpanato]

hey @mxinden yes I can work on that 😄
Do I open a PR to the alertmanager repo?

[metalmatze]

This is something that I've already thought about integrating into my alertmanager-bot. If that is something you'd be interested in, we could work on that as well.

[brancz]

more generally as we're not merging new notifiers, why make an exception for mattermost (don't get me wrong I would like support, but we need to be consistent)?

[cpanato]

agree @brancz

[roidelapluie]

@brancz the issue clearly says it is a webhook, not a notifier.

[brancz]

@roidelapluie :man_facepalming: sorry I came here through the tweets and there it sounded like this was going to be implemented in Alertmanager itself. In that case, do we need an issue here?

[metalmatze]

I've created an issue to discuss, if we might want to add support for Mattermost to the alertmanager-bot.
https://github.com/metalmatze/alertmanager-bot/issues/25

[mxinden]

Both a separate webhook as well as the integration via alertmanager-bot sounds good to me. @metalmatze @cpanato let me know if you need some help.

In that case, do we need an issue here?

Just thought it is most convenient to plan it here. Once this takes more shape we can close this issue.

[cpanato]

sorry for the delay, i will check both

[trennepohl]

Hello people, I've found this article here and it works pretty well
http://tfahl.com/2018/08/01/using_mattermost_as_a_receiver_for_alertmanager.html