Worked on the prometheus/alertmanager repository to enhance the reliability and maintainability of debugging tools, specifically addressing compatibility issues with pprof debug endpoints when custom route prefixes are used. The solution involved reconstructing request subpaths and preserving trailing slashes to ensure correct handler matching, thereby improving endpoint accessibility. Unit tests were added to verify pprof behavior both with and without route prefixes, aligning with existing testing patterns and updating related infrastructure. This backend development effort, implemented in Go and focused on API development and testing, reduced friction for users deploying with custom configurations and improved the overall observability of alertmanager deployments.