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Alertmanager Matrix

Alertmanager Matrix provides a webhook endpoint that takes alerts and sends them to a Matrix room.

Running this software

./alertmanager_matrix <flags>

Building the software

make

Packages

This software is available in the AUR: alertmanager-matrix

If you're interested in a package for your favorite distro, please let me know!

Configuration

Alertmanager Matrix is configured via a configuration file and command-line flags (such as what configuration file to load, what port to listen on, and the logging format and level).

The configuration file is written in YAML format. <tmpl_string> is a Golang text/template string and <http_config> has the same fields as Alertmanager's http_config.

To authenticate to a standard Matrix server, specify an access token as the bearer token in matrix_http_config.

homeserver_url: <string>
text: <tmpl_string>
matrix_http_config: <http_config>

Alertmanager Matrix can reload its configuration file at runtime. If the new configuration is not well-formed, the changes will not be applied. A configuration reload is triggered by sending a SIGHUP to the process or by sending a HTTP POST request to the /-/reload endpoint.

To view all available command-line flags, run ./alertmanager_matrix -h.

To specify which configuration file to load, use the --config.file flag.

Additionally, an example configuration is also available.

Template data

The text template is executed with an Alerts struct parsed from Alertmanager's webhook JSON format.

type Alerts struct {
	Alerts            []Alert           `json:"alerts"`
	CommonAnnotations map[string]string `json:"commonAnnotations"`
	CommonLabels      map[string]string `json:"commonLabels"`
	ExternalURL       string            `json:"externalURL"`
	GroupKey          string            `json:"groupKey"`
	GroupLabels       map[string]string `json:"groupLabels"`
	Receiver          string            `json:"receiver"`
	Status            string            `json:"status"`
	TruncatedAlerts   int               `json:"truncatedAlerts"`
	Version           string            `json:"version"`
}

type Alert struct {
	Annotations  map[string]string `json:"annotations"`
	EndsAt       time.Time         `json:"endsAt"`
	GeneratorURL string            `json:"generatorURL"`
	Labels       map[string]string `json:"labels"`
	StartsAt     time.Time         `json:"startsAt"`
	Status       string            `json:"status"`
}

Alertmanager Configuration

This webhook receiver needs to be configured as an Alertmanager webhook_config. A room_id query parameter must be supplied. Only raw room IDs are supported (must start with a !), aliases will not work.

To send routes to different rooms, define multiple receivers with different room_ids.

...

receivers:
- name: 'matrix'
  webhook_configs:
    - url: http://127.0.0.1:9751?room_id=!YiweMkCfAD:matrix.org

...

Other endpoints

/metrics

Exports Prometheus metrics.

/config

Outputs the current YAML config, with secrets redacted.

/-/reload

POST requests to this endpoint trigger a configuration reload.

/-/healthy and /-/ready

Always respond with an HTTP 200.