Alertmanager configuration

In Chapter 9, Defining Alerting and Recording Rules, we discussed how Prometheus generates and pushes out alerts. Having also made clear the distinction between an alert and a notification, it's now time to use Alertmanager to handle the alerts that are sent by Prometheus and turn them into notifications.

Next, we'll go through the configuration required on Prometheus, along with the configuration options available in Alertmanager, so that we have notifications going out from our monitoring stack.

Prometheus configuration

There are a couple of configurations that need to be done in Prometheus so that we can start using Alertmanager. The first thing to do is configure the external labels...