During September 2024, Bart Smit extended Kubernetes endpoint discovery in the prometheus/prometheus repository to support ports from sidecar containers in both endpoints and endpoint slices. He implemented startup logic that delays discovery until sidecar containers are ready, addressing startup race conditions in multi-container deployments. Using Go and the Kubernetes API, Bart added comprehensive unit and integration tests to validate sidecar support and updated existing tests with new labels. His work focused on robust feature delivery and test coverage rather than bug fixes, enhancing monitoring reliability for cloud infrastructure environments and demonstrating depth in Kubernetes, Go, and automated testing practices.