How to monitor OPA Gatekeeper with Prometheus metrics

Jorge Salamero Sanz explains how to monitor the Open Policy Agent (OPA) Gatekeeper using Prometheus metrics, emphasizing its importance as a Kubernetes admission controller that ensures compliance with organizational policies by auditing and enforcing them. Gatekeeper, a subproject of OPA, utilizes a customizable policy evaluation framework, enabling users to create constraints and templates for Kubernetes objects, and exposes a Prometheus metrics endpoint for monitoring its performance and health. By configuring Prometheus or Sysdig for metric collection, users can monitor various metrics such as constraint counts, request durations, and audit violations. Sysdig provides an Open Policy Agent Gatekeeper dashboard for security monitoring, which is compatible with both Sysdig and Grafana platforms. The article highlights the integration of security and monitoring in DevOps workflows, showcasing how Sysdig's Prometheus capabilities enhance the security and performance monitoring of Kubernetes environments.