Denis Stolyarov updated the CODEOWNERS file in the actions/actions-runner-controller repository to align code review routing with current maintainership. By introducing a new maintainer alias and reflecting recent changes in ownership, Denis improved the accuracy of pull request assignments and reduced review delays. The work involved Git-based collaboration and code ownership management, ensuring that contributions are reviewed by the appropriate maintainers. This governance-focused update streamlined cross-team coordination and minimized the risk of misrouted changes. Denis applied DevOps practices and leveraged YAML configuration to implement the feature, demonstrating a methodical approach to maintainership governance within a collaborative open source environment.