matrix-alertmanager

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matrix-alertmanager

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A bot to receive Alertmanager webhook events and forward them to chosen rooms.

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[![](https://img.shields.io/docker/pulls/jaywink/matrix-alertmanager.svg)](https://hub.docker.com/r/jaywink/matrix-alertmanager) [![](https://img.shields.io/matrix/matrix-alertmanager:federator.dev.svg?server_fqdn=federator.dev)](https://matrix.to/#/#matrix-alertmanager:federator.dev)

# Matrix-Alertmanager

![](https://raw.githubusercontent.com/jaywink/matrix-alertmanager/master/screenshot.png)

A bot to receive Prometheus Alertmanager webhook events and forward them to chosen rooms.

Main features:

* Uses pre-created Matrix user to send alerts using token auth.
* Configurable room per alert receiver.
* Automatic joining of configured rooms. Private rooms require an invite.
* Secret key authentication with Alertmanager.
* HTML formatted messages.
* Optionally mentions `@room` on firing alerts

## How to use

### Configuration

Whether running manually or via the Docker image, the configuration is set 
via environment variables. When running manually, copy `.env.default`
into `.env`, set the values and they will be loaded automatically. 
When using the Docker image, set the environment variables when running 
the container.

### Docker

The [Docker image](https://hub.docker.com/r/jaywink/matrix-alertmanager) `jaywink/matrix-alertmanager:latest` is the easiest way to get the service running. Ensure you set the required environment variables listed in `.env.default` in this repository.

### Alertmanager

You will need to configure a webhook receiver in Alertmanager. It should looks something like this:

```yaml
receivers:
- name: 'myreceiver'
  webhook_configs:
  - url: 'https://my-matrix-alertmanager.tld/alerts?secret=veryverysecretkeyhere'
```

The secret key obviously should match the one in the alertmanager configuration.

Alternatively, put the secret in a separate file and use basic auth with username `alertmanager`:

```yaml
receivers:
- name: 'myreceiver'
  webhook_configs:
  - url: 'https://my-matrix-alertmanager.tld/alerts'
    http_config:
      basic_auth:
        username: alertmanager
        password_file: /path/to/password.secret
```

### Prometheus rules

Add some styling to your prometheus rules

```yaml
rules:
- alert: High Memory Usage of Container
 annotations:
 description: Container named {{\$labels.container_name}} in {{\$labels.pod_name}} in {{\$labels.namespace}} is using more than 75% of Memory Limit
 expr: |
 ((( sum(container_memory_usage_bytes{image!=\"\",container_name!=\"POD\", namespace!=\"kube-system\"}) by (namespace,container_name,pod_name, instance) / sum(container_spec_memory_limit_bytes{image!=\"\",container_name!=\"POD\",namespace!=\"kube-system\"}) by (namespace,container_name,pod_name, instance) ) * 100 ) < +Inf ) > 75
 for: 5m
 labels:
 team: dev
```

NOTE! Currently, the bot cannot talk HTTPS, so you need to have a reverse proxy in place to terminate SSL, or use unsecure unencrypted connections.

## TODO

* Registering an account instead of having to use an existing account

## Tech

Node 22, Express, Matrix JS SDK

## Help

Come chat in the https://matrix.to/#/#matrix-alertmanager:federator.dev room!

## Author

Jason Robinson / https://jasonrobinson.me / @jaywink:federator.dev

## License

MIT

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