bufsize:bufsize
debug:debug
prometheus:metrics
errors:errors
log:log
dns64:dns64
acl:acl
any:any
chaos:chaos
loadbalance:loadbalance
cache:cache
dnssec:dnssec
synthetic:code.fritzlab.net/dns/synthetic@205a7331b18601536a6db978b66f7d8b1851343a
unbound:github.com/coredns/unbound
file:file
forward:forward
on:github.com/coredns/caddy/onevent
sign:sign