What Is Prometheus?

Prometheus is an open-source monitoring and alerting toolkit, originally developed at SoundCloud in 2012. It was created to monitor highly dynamic, distributed systems and has since become one of the most widely adopted monitoring solutions in cloud-native environments.

It is a graduated project of the Cloud Native Computing Foundation (CNCF). This means it is production-ready, widely adopted, and actively maintained within the cloud-native ecosystem alongside projects like Kubernetes.

Designed with reliability in mind. Prometheus is built to operate independently, without relying on external distributed storage. It can continue functioning and collecting metrics even when other parts of the infrastructure are experiencing issues.

Uses a pull-based model. Instead of services pushing data to a central server, Prometheus periodically scrapes (pulls) metrics from configured targets. This model simplifies service discovery, improves reliability, and gives Prometheus control over collection intervals.