# Alertmanager

Example Alertmanager configuration for the optional observability profile.

`alertmanager.yml` is intentionally safe by default: it routes to a `null`
receiver, so alerts are grouped but dropped. Before using it outside local
development, add a real receiver and set `route.receiver` to that receiver.

Monlet can also send notifications to Alertmanager through the server notifier:

```env
MONLET_NOTIFIER_ALERTMANAGER_ENABLED=true
MONLET_NOTIFIER_ALERTMANAGER_URL=http://alertmanager:9093
```

Keep labels stable and low-cardinality. The example groups by `alertname`,
`agent_id`, and `check_id`; do not add timestamps, event IDs, or output text to
Alertmanager labels.