How does Oathkeeper conf and rules work. I set the global configuration for _cookie_session_ to a given URL:

authenticators:
    cookie_session:
      enabled: true
      config:
        check_session_url: <https://auth.myDomain/sessions/whoami>
        preserve_path: true

Now, do I need to repeat the URL in EVERY rule I define? If so, what is the point of having a global conf as well as a per rule conf, knowing that values are the same.

you dont have to repeat the configuration if it's the same