Michal Grzesiak enhanced crash debugging capabilities in the facebook/buck2-prelude repository by introducing targeted instrumentation to the merge-map debugging path. Focusing on build system development and debugging tools, Michal used Starlark to report non-asset constituents within merged library groups, addressing a recurring issue where merged libraries transitioned to non-asset status and caused crashes. This approach enabled faster triage and resolution by making it easier to identify problematic targets, thereby improving reliability and reducing mean time to recovery. The work increased maintainability and observability of merge maps, supporting more efficient crash investigations and contributing to overall product stability for developers.