Setting up Prometheus alerting for our microservices

In this section, we will illustrate how to set up service alerting using Prometheus and its alerting extension, Alertmanager, for the services we created in previous chapters. You will learn how to expose the service metrics for collection, how to set up Prometheus and Alertmanager to aggregate and store the metrics from multiple services, and how to define and process service alerts.

Our high-level approach is as follows:

1. Set up Prometheus metric reporting to our services.
2. Install Prometheus and configure it to scrape the data from the three example services that we created in previous chapters.
3. Configure service availability alerts using Alertmanager.
4. Test our alerts by triggering an alerting condition and running Alertmanager.

Let’s start by illustrating how to integrate our services with Prometheus. To do this, we need to add a metric collection to our services by exposing an endpoint that...