As a DNS administrator,
I would like to be able to collect and view metrics for a specific QNAME,
So that I can get detailed analysis and insights related exclusively to that QNAME.

Currently we support filtering based on only_qname_suffix, which isn't limited to a specific QNAME and includes all QNAMES that end with the specified suffixes.

The target solution would allow filtering against a list of specific QNAMES and require an exact match:

filter:
  only_qnames: [ www.foo.bar, blah.example.org]