A simple webhook notification relay for Prometheus Alertmanager.

First, you'll need two environment variables:

• TELEGRAM_CHAT_ID: Your Telegram user ID. Retrieve it from @userinfobot.
• TELEGRAM_TOKEN: An API token for a bot you created to send you the alert messages. Create one via @botfather.

Next, provide the variables to the docker container:

docker run \
    --name alertmanager-telegram \
    -e TELEGRAM_CHAT_ID="..." \
    -e TELEGRAM_TOKEN="..." \
    -p 8080:8080 \
    ghcr.io/janw/alertmanager-telegram

Finally, in the Alertmanager config, add the relay as a webhook receiver:

receivers:
  - name: "telegram"
    webhook_configs:
      - url: "http://alertmanager-telegram:8080/alerts"
        send_resolved: true

A custom alert template can be added by overriding /templates/default.html:

docker run \
    --name alertmanager-telegram \
    -e TELEGRAM_CHAT_ID="..." \
    -e TELEGRAM_TOKEN="..." \
    -v /path/to/my/template.html:/templates/default.html \
    -p 8080:8080 \
    janwh/alertmanager-telegram