https://github.com/etcd-io/etcd/issues/9161 https://github.com/etcd-io/etcd/issues/10537 https://github.com/etcd-io/etcd/pull/10913 https://kubernetes.io/blog/2019/08/30/announcing-etcd-3-4/
etcd-io/etcd#9161
etcd-io/etcd#10537
etcd-io/etcd#10913
https://kubernetes.io/blog/2019/08/30/announcing-etcd-3-4/