The highest tagged major version is v4.

skydns/

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Path	Synopsis
backends
etcd Package etcd provides the default SkyDNS server Backend implementation, which looks up records stored under the `/skydns` key in etcd when queried.	Package etcd provides the default SkyDNS server Backend implementation, which looks up records stored under the `/skydns` key in etcd when queried.
cache
msg
server Package server provides a DNS server implementation that handles DNS queries.	Package server provides a DNS server implementation that handles DNS queries.