A Rocket.Chat webhook that receives Prometheus Alertmananager alerts, creates concise messages and routes them to the actual channel.

See https://rocket.chat/docs/administrator-guides/integrations/ for details on how to generate Rocket.Chat webhooks.

Rocket.Chat messages produced by this webhook will have the following basic format (based on the keys in the Alertmanager request):

[annotations.severity OR status] annotations.summary
annotations.description

You are responsible to put all labels you would like to see into the summary or the description when you define the alert rules for Prometheus. The description is optional, leave it empty if it does not contain additional information.

You may optionally set the label rocketchat_channel in the alert rule to route a message to a custom channel.

Login as admin user and go to: Administration => Integrations => New Integration => Incoming WebHook

Set "Enabled" and "Script Enabled" to "True".

Set channel, icons, etc. as you need.

Paste the contents of webhook.js into the Script field.

Create Integration. Copy the WebHook URL and proceed to Alertmanager.

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

route:
  receiver: rocketchat

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

Reload/restart Alertmanager.

To test the webhook, you may send a sample request to your Rocket.Chat instance:

curl -X POST -H 'Content-Type: application/json' --data-binary @sample-request.json [webhook-url]

prometheus-rocket-chat is released under the terms of the MIT License. Copyright 2019-2020 Puzzle ITC GmbH. See LICENSE for further information.