We used Hydra 0.9.15 many years back and wanting to upgrade it to the latest version. We use the client credentials grant for our internal service to service communication, and used the /warden/token/allowed endpoint to verify tokens. Hence we manage Hydra policies with subjects and resources to control access between services.
However since Hydra 1.0, warden/policies have been moved out of Hydra and into Keto. So what should be our approach to upgrade Hydra to the latest and still maintain the warden capability? Can Hydra and Keto work together and how to hook them up?? Thank you!