DNS/cookies/kresdについて、ここに記述してください。
https://knot-resolver.readthedocs.io/en/v2.2.0/modules.html#dns-cookies
Example Configuration
The module must be loaded before any other module that has direct influence on query processing and response generation.
The module must be able to intercept an incoming query before the processing of the actual query starts.
It must also be able to check the cookies of inbound responses and eventually discard them before they are handled by other functional units.