dnsdist: Add queries/responses handled by packetcache into ringbuffers?

[aj-gh]

• Program: dnsdist
• Issue type: Bug report / Feature Request

Short description

Queries handled by the packet cache don't seem to end up in the ringbuffers. This makes dynamic query counting, e.g. via exceedServFails(), useless for the usual repeating packet floods by misbehaving clients on similar FQDNs.
While it certainly has some performance impact I wonder if it would make sense to adjust the ring buffers so that they can also be used for proper counting of queries hitting the caches, potentially in a configurable way. Or look into a different solution for being able to handle excessive clients/queries without causing excessive performance impact.
If kept as is I think the current behavior might be missing some documentation at ringbuffers / dynamic blocks.
(As discussed)