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DevOps & Automation · Intermediate

Prometheus

An open-source CNCF graduated monitoring system and time-series database that scrapes metrics over HTTP and supports alerting with PromQL.

Definition

Prometheus uses a pull model, scraping /metrics endpoints from targets found via service discovery. It stores labeled time series locally and evaluates recording and alerting rules, sending alerts to Alertmanager. It is the de facto metrics standard for Kubernetes.

Example

A scrape config collects metrics every 15s from all pods annotated for scraping.

Exam tip

Prometheus pulls (scrapes) by default; use the Pushgateway only for short-lived batch jobs.

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