alertmanager-webhook-fcm

Prometheus Alertmanager receiver that sends messages via Firebase Cloud Messaging

Usage

Alertmanager API endpoint

Configure the /alert/<topic> API endpoint in alertmanager.yml.

You may configure this webhook in multiple receivers push messages to different Firebase Cloud Messaging topics:

receivers:
- name: 'webhook.all'
  webhook_configs:
  - url: 'http://alertmanager-webhook-fcm:9716/alert/all'
- name: 'webhook.important'
  webhook_configs:
  - url: 'http://alertmanager-webhook-fcm:9716/alert/important'

Generic API endpoint

There is a generic API endpoint that can be used to send simple notifications. It accepts a less comlex JSON format then alertmanager uses:

curl --header "Content-Type: application/json" \
  --request POST \
  --data '{"title":"The message title", "body":"The message body"}' \
  http://localhost:9716/generic/your-topic

Permissions

This webhook needs cloudmessaging.messages.create permission for your Firebase project.

You may want to create a custom IAM role with only this permission and assign a new service account to it. Download the service account JSON file and set the environment variable GOOGLE_APPLICATION_CREDENTIALS to its absolute path.

Docker (compose)

The container will need access to some root CA to verify Google's SSL certificates. You may want to mount your host certificates, llike:

version: "2"
services:
  alertmanager-webhook-fcm:
    container_name: alertmanager-webhook-fcm
    image: jaymedh/alertmanager-webhook-fcm:v0.2
    ports:
      - 9716:9716
    environment:
      - GOOGLE_APPLICATION_CREDENTIALS=/etc/serviceAccountKey.json
    volumes:
      - /etc/ssl/certs:/etc/ssl/certs:ro
      - /serviceAccountKey.json:/etc/serviceAccountKey.json:ro
    restart: unless-stopped