Worked on the facebookincubator/cinderx repository to standardize dynamic tracing instrumentation by replacing FOLLY_SDT() macros with USDT() macros from the usdt.h library. This change unified the tracing probe mechanism across the codebase, improving consistency and maintainability while ensuring no impact on runtime behavior or performance. The work involved careful library integration and system programming in C++, with a focus on tracing infrastructure. By establishing a consistent approach to dynamic tracing, the update laid a solid foundation for future observability enhancements, enabling more reliable monitoring and diagnostics without introducing risk to the existing system’s stability or efficiency.