Hi @ghostdan, the old (it’s not changed) Ubuntu install guide doesn’t mention them no, but the update guide you’d need to follow to upgrade an existing site is here:
That does have a callout to explain you need to switch if you want the new Analytics feature.
I’ll add the same callout to the ubuntu install guide.
To be clear, the docker compose method is in preview, not yet a recommended setup 
You can use our hosted ActivityPub service with any self-installed Ghost, up to the documented limits: How To Install Ghost With Docker (preview) - Ghost Developer Docs