@philips We shouldn't need to version log files as long as a single `etcd` can span multiple versions. We should probably snapshot after performing an upgrade so we don't have to worry about supporting old versions indefinitely.

The next version will have `etcd:v3` as a prefix. I just wanted to keep the original `etcd:` prefix here since v2 is a superset of v1 and it'll let us smoothly upgrade.