Imports github.com/prometheus/client_golang/prometheus golang.org/x/net/context github.com/opentracing/opentracing-go github.com/miekg/dns github.com/coredns/coredns/request github.com/coredns/coredns/plugin/etcd/msg github.com/coredns/coredns/plugin/pkg/dnsutil Standard library imports errors fmt math net strconv strings