Worked on the aws/aws-advanced-jdbc-wrapper repository to enhance the reliability and accuracy of host metric collection for MySQL databases. Focused on resolving a type mismatch in the RdsHostListProvider by updating CPU utilization and node lag metrics from float to double, which improved precision and reduced false alerts in production environments. The solution involved modifying both the provider logic and associated unit and integration tests to ensure regression safety and long-term stability. Utilized Java, JDBC, and database interaction skills to maintain release readiness, with clear commit traceability and comprehensive test coverage supporting ongoing reliability for host discovery and metric reporting.