For now, only tracing for the FreeRTOS real-time operating system is available.
See the RTEdbg trace macro integration guide FreeRTOS for instructions on how to integrate RTEdbg toolkit based RTOS trace into the FreeRTOS system. All files necessary for the trace integration are in the FreeRTOS/v1 folder.
See also some additional hints about how to add logging FreeRTOS internal fault detection in the document RTOS Error Handling and Reporting.
For a quick start with VCD Viewer GTKWave without a lot of reading, see GTKWave - Quick Introduction and Shortcuts.