DNSDog is a small utility for generating metrics for DNS queries and replies and sending them to statsd. It's functionally similar to the DNS plugin for collectd but optimized for datadog.
Grab the latest release from here.
Start watching for DNS packets on eth0 and send them to statsd:
$ dnsdog -iface eth0 -statsd "127.0.0.1:8125"
DNSDog generates the following metrics and tags:
dns.query{op_code}
dns.question{op_code,query,query_type}
dns.reply{response_code}
dns.reply.question{response_code,query,query_type}
dns.answer{response_code,query,query_type}
dns.reply.time{response_code}