This session is a comprehensive exploration of actions-runner-controller, an open-source Kubernetes operator originally initiated by the community to tackle the challenges of managing and scaling GitHub Actions self-hosted runners. Due to its exceptional popularity, actions-runner-controller was adopted, maintained, and transformed into a supported offering by GitHub. Join us as we delve into the intricacies of its design, development, and release processes. Gain valuable insights into the inner workings of actions-runner-controller, comprehensively understanding its architecture and implementation.