Ella Hathaway upgraded the prebuilt baseline of the dotnet/sdk repository by updating System.Diagnostics.DiagnosticSource to version 8.0.1, focusing on improving long-term maintainability and compatibility. She modified the build configuration to pin the new package version, ensuring the SDK consistently uses the latest stable diagnostic source library. This work, implemented using C# and MSBuild, addressed the need for enhanced observability and reduced maintenance risk for downstream consumers. By aligning the SDK with the current DiagnosticSource release, Ella’s contribution provided a stable foundation for future development. The scope was targeted, with depth in dependency management and build system configuration.