Resolver no longer indicates which records have been cached
The ranked RR array has a field that used to indicate whether the record was cached or not. This is still checked, but never set to true so it's not possible to find out which records have been written to cache and which records are coming from cache.
https://gitlab.labs.nic.cz/knot/knot-resolver/blob/master/lib/utils.h#L148
cc @anb