Hello David,
Efficient IP SOLIDserver appliances provides statistics for DNS and DHCP services over SNMP.
They are available immediately after service is enabled and started on appliance or alternatively on package version available for several Linux based distribution (Redhat/Ubuntu).
In case you are interested in particular values like Number of queries, Number of Authoritative / Non-Authoritative answers / Returns Codes, please let me know.
I can pull info you are looking for.
Best Regards,
Peter
Efficient IP Delivery Team