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The session introduced Prometheus as a monitoring tool for observing infrastructure and application health, particularly in container-centric environments, and covered its core components including the pull-based mechanism, time series database, and query language capabilities. Preethi demonstrated the installation of Prometheus and Grafana using Docker containers, showing how to configure monitoring for various services and visualize data through Grafana dashboards. The class concluded with plans to cover Jenkins monitoring and customizing Grafana dashboards in the next session.