Prometheus

Prometheus is an open-source monitoring and alerting toolkit originally built at SoundCloud and now widely adopted across the industry. It collects metrics by scraping data from configured targets at regular intervals, stores them in a time-series database, and provides a powerful query language called PromQL to analyze and visualize the data. While not network-specific, Prometheus is commonly used in modern infrastructure to monitor network devices, services, and applications, often paired with Grafana for visualization and alerting.