Just implementing the paper "Causal network telemetry".
Yunhe Liu, Nate Foster, and Fred B. Schneider. 2022. Causal network telemetry. In Proceedings of the 5th International Workshop on P4 in Europe (EuroP4 '22). Association for Computing Machinery, New York, NY, USA, 46–52. https://doi.org/10.1145/3565475.3569084