Currently the deprecation warning reads:

You are viewing documentation for etcd version: v3.1

etcd v3.1 documentation is no longer actively maintained. The version you are currently viewing is a static snapshot. For up-to-date documentation, see the latest release, v3.4, or the current documentation.

It should refer to "... the latest release, v3.4, or the next version documentation.", not "current."

Example page: https://etcd.io/docs/v3.1/metrics/