Hands-On Infrastructure Monitoring with Prometheus

Routing

When an alert batch reaches this phase, Alertmanager needs to decide where to send it. Since the most common use cases are to have different people interested in different alerts, different notification methods for different alert severities, or even a combination of both, this step enables just that by way of a routing tree. It is composed of routes (if any), each of which specifies a match criteria for one or more labels and a receiver, and a root node, which defines a catch-all receiver in case none of the sub-routes have a match for the alert groups passing through. Sub-routes can have their own routes, making it a multi-level tree. Matching is done in the order the routes are declared in, going into defined sub-routes first when ...