Worked on the kadai-io/kadai repository to enable energy and resource usage measurement in support of Blue Angel certification. Developed and integrated the Green Metrics Tool (GMT) with comprehensive load-testing scaffolding, establishing a foundation for measuring application resource and energy consumption under realistic user scenarios. Implemented usage scenario scripts and k6 test cases, including warm-up, pause, and standard usage flows, to simulate authentic user interactions and support certification requirements. Utilized JavaScript, YAML, and Docker to create reusable infrastructure for performance testing, enhancing observability and accelerating future certification efforts while providing a robust baseline for ongoing sustainability and efficiency improvements.