ETW OVR-SDK-LibOVR events documentation

Hey,
i am using the ETW logger to profile my application. and i am having hard time to understand all the events availble.
for example, i get a log event:
{'Message': 'App EndFrame 1967', 'Task': 'Log', 'Opcode': 'Begin', 'Channel': 'LibOVR/Analytic', 'Level': 'Information'} 

and a distort event:

{'Message': 'Begin distortion rendering for 0 (frame 8874)', 'Task': 'Distort', 'Opcode': 'Begin', 'Channel': 'LibOVR/Analytic', 'Level': 'Information'}

How can i relate the distortion and timewarp to the app frame? (they have different counters) i want to know what frame is being distorted, is it the previous one? the latest?

Thanks
Aviel