Worked on the envoyproxy/envoy repository to address a health monitoring issue in backend systems using C++ and backend development skills. Focused on improving the accuracy of health reports by implementing a targeted fix that clears the last HTTP health status code when network failures occur, preventing stale or misleading health metadata after an upstream becomes unreachable. The solution included adding a dedicated unit test to validate the clearance logic following timeout-driven failures and updating release notes to document the change. This narrowly-scoped update introduced no API changes and maintained low risk, enhancing reliability and observability for upstream health checks.