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QryDropped stats counter documentation update

Follow-up from @ondrej's message in a MM discussion:

The resolver will return DNS_R_DROP for both fetches-per-zone and clients-per-query And optionally for fetches-per-server. And QryDropped counts them all. So, now we have:

  • ZoneQuota counts fetches-per-zone (and the counting is kind of broken)
  • ServerQuota counts fetches-per-server
  • ClientQuota counts clients-per-quota (new counter)
  • QryDropped sum of all the above (if fetches-per-server NN drop; is used)

The documentation for QryDropped should be updated to include the information above.

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