AlertmanagerRocketChar

Overview

AlertmanagerIntegration is script that will parse webhook notifications coming to Rocket.Chat.

Installation

Rocket.Chat

Login as admin user and go to: Administration => Integrations => New Integration => Incoming WebHook
Set "Enabled" and "Script Enabled" to "True"
Set all channel, icons, etc. as you need
Paste contents of AlertmanagerIntegrations.js into Script field.
Create Integration. You;ll see some values apper. Copy WebHook URL and proceed to Alertmanager.

Alertmanager

Create new receiver or modify config of existing one. You'll need to add webhooks_config to it. Small example:

route:
    repeat_interval: 30m
    group_interval: 30m
    receiver: 'rocketchat'

receivers:
    - name: 'rocketchat'
      webhook_configs:
          - send_resolved: false
            url: '${WEBHOOK_URL}'

Reload/restart alertmanager.

If everything is OK you should see alerts like this:

NOTES

Alertmanager doesn't actually sends singular alerts - it sends array of current alerts, so it doesn't seem possible for now to split then in separate messages, but if you want, you can configure separate alerts/receivers/webhooks.

Alertmanager Docs