Worked on enhancing the reliability of the Grafana Prometheus test suite by focusing on queue management and sampling tests. Addressed test flakiness by removing an obsolete benchmark test to ensure alignment with production behavior and resolved a race condition involving backoff and age limits in sampling tests. These changes improved test determinism, accelerated CI feedback, and reduced maintenance overhead within the grafana/prometheus repository. Utilized Go programming and software testing skills to deliver targeted improvements, emphasizing robust test design and maintainability. The work contributed to a more stable continuous integration process and streamlined the development workflow for future enhancements.