Integration with Prometheus / Alertmanager / Grafana monitoring

[ngosang]

Is your feature request related to a problem? Please describe.
No, it isn't.

Describe the solution you'd like
Nowadays it's really common to use Prometheus / Alertmanager / Grafana stack for monitoring and alerting. All components are written in Go and they are open-source.
The notification / alerts in case of events / errors can be configured in 2 places:

Alertmanager (the recommended place)

• It doesn't has integration with Gotify and the the authors are not interested. => Feature suggestion: Add Gotify as receiver prometheus/alertmanager#2120
• They provide a Webhook mechanism to send notifications via POST request.
• Some users have implemented they own bridges (take a look at the previous issue). I'm using => https://github.com/DRuggeri/alertmanager_gotify_bridge

Grafana

• Same issues as Alertmanager. They don't have Gotify support but they provide a Webhook.
• It looks like some users have Grafana => Gotify notifications working but they are not configurable enough. => Make default priority configurable server#312

Feature request
I think those software are really popular and the integration with Gotify should be easier to configure.

• Gotify should provide native integration for those Webhooks or an official plugin. This project is working but the author was not able to convert the server into a plugin => https://github.com/DRuggeri/alertmanager_gotify_bridge
• Improve documentation about Alertmanager / Grafana integration. At least add some notes.

[jmattheis]

I don't think I want to support something like this officially. I'll move this issue to gotify/contrib, if someone wants to create a plugin for this, I'd be happy to help.