Imports github.com/miekg/dns github.com/prometheus/client_golang/prometheus github.com/prometheus/client_golang/prometheus/promauto github.com/prometheus/client_golang/prometheus/promhttp github.com/urfave/cli/v2 go.etcd.io/bbolt golang.org/x/net/idna Standard library imports encoding/json fmt io/ioutil log net/http os os/signal strconv strings sync syscall time