Prometheus is a leading open-source monitoring and alerting system designed for modern cloud-native environments. It features a dimensional data model, flexible query language (PromQL), and efficient time series database that enables comprehensive monitoring of applications, systems, and services. The platform excels at collecting and storing metrics as time series data, providing powerful querying capabilities for analysis and visualization. Prometheus integrates seamlessly with Kubernetes and other container orchestration platforms, automatically discovering and monitoring services in dynamic environments. Its pull-based architecture allows for reliable metric collection from instrumented applications. As the second project to graduate from the Cloud Native Computing Foundation (CNCF) after Kubernetes, Prometheus has become the de facto standard for monitoring in cloud-native ecosystems. It supports multi-dimensional data collection, flexible alerting rules, and integrates with popular visualization tools like Grafana for comprehensive observability dashboards. The system is particularly valuable for DevOps teams, site reliability engineers, and developers who need robust monitoring capabilities for microservices architectures, containerized applications, and distributed systems. Its active community and extensive ecosystem of exporters make it suitable for monitoring virtually any type of infrastructure or application component.