Developed external tracing module support for the zephyrproject-rtos/zephyr repository, introducing a CONFIG_TRACING_CUSTOM option that allows integration of custom tracing headers and macro-level extension of tracing APIs. This work, implemented in C and focused on embedded systems and RTOS development, addressed upstream enhancement requests to enable out-of-tree tracing backends. By improving observability and debuggability across Zephyr deployments, the feature reduces integration effort for future tracing solutions and lays groundwork for extensibility. The approach aligned closely with community needs, providing a flexible mechanism for external tracing integration without modifying core code, and enhancing the overall maintainability of Zephyr-based projects.