Grafana and Prometheus are two popular open-source tools used for monitoring and visualizing metrics data in complex systems. Prometheus is a time-series database and monitoring system that collects metrics from various sources, such as servers, applications, and services. It allows users to define alerts and generate graphs and dashboards to analyze the collected data. Grafana, on the other hand, is a platform for visualizing and analyzing data. It allows users to create customized dashboards that display data from multiple sources, including Prometheus. Grafana provides a user-friendly interface for data exploration and allows users to interact with data using various visualization tools, such as graphs, charts, and tables. Together, Prometheus and Grafana form a powerful combination for monitoring and visualizing metrics data, making it easier for users to identify trends, troubleshoot issues, and optimize system performance.