Learn how to set up and configure Alertmanager for Prometheus in this comprehensive tutorial video. Discover the process of installing Alertmanager, configuring it to work with Prometheus, and creating custom alerting rules. Explore key topics including setting up an instance down alert, updating the Prometheus container, working with expressions, creating a low disk space alert with rounding, and implementing a certificate expiry alert. Gain practical knowledge to effectively monitor your systems and receive timely notifications for potential issues.