Prometheus

Prometheus is a robust monitoring and alerting toolkit designed for reliability and scalability. Their key features include a multi-dimensional data model that identifies time series data by metric names and key/value pairs, and PromQL, a flexible query language that leverages this dimensionality. Prometheus operates on a pull model for time series collection over HTTP, with support for pushing time series via an intermediary gateway. They do not rely on distributed storage, ensuring that single server nodes remain autonomous. Additionally, Prometheus supports various modes of graphing and dashboarding, integrates seamlessly with visualization tools like Grafana, and includes components such as client libraries, a push gateway, and an alert manager.