clientListenURLsEnv   = "LISTEN_CLIENT_URLS"
	clientListenURLFmt    = "http://127.0.0.1:%d"
	targetVersionEnv      = "TARGET_VERSION"
	targetStorageEnv      = "TARGET_STORAGE"
	etcdDataPrefixEnv     = "ETCD_DATA_PREFIX"
	etcdDataPrefixDefault = "/registry"
	ttlKeysDirectoryFmt   = "%s/events"
	etcdServerArgsEnv     = "ETCD_CREDS"
)

type migrateOpts struct {
	name              string
	port              uint64