Configuring Prometheus Alertmanager

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Configuring Prometheus Alertmanager

Prometheus Alertmanager provides useful functionality around processing and managing alerts triggered by your Prometheus metric data. In this lab, you will have the opportunity to gain some hands-on experience with the process of configuring Alertmanager itself. You will be able to work with a real Alertmanager instance, making configuration changes to it.

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Lab Info

Level

Intermediate

Last updated

Sep 24, 2025

Duration

30m

Challenge

Set the `from` Address for Email Alerts
1. Log in to the Prometheus server.
2. Edit the Alertmanager configuration file:
  
  sudo vi /etc/alertmanager/alertmanager.yml
3. Set global.smtp_from to [email protected]:
  
  global: smtp_from: [email protected] ...
Challenge

Add the Requested Templates Directory
1. Edit the Alertmanager configuration file:
  
  sudo vi /etc/alertmanager/alertmanager.yml
2. Add the requested directory as a notification template location:
  
  templates: - "/etc/alertmanager/templates/*.tmpl"
3. Restart Alertmanager to load the new configuration:
  
  sudo systemctl restart alertmanager
4. Verify your configuration is valid by ensuring Alertmanager is running. Access Alertmanager in your browser: http://<PROMETHEUS_SERVER_PUBLIC_IP>:9093
5. Once you can see Alertmanager in your browser, click Status and look for your new configuration options in the Config section.

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