We're laying the groundwork to retire Redis namespaces from a future release of the Mastodon server code. See the update from @David Roetzel on GitHub - and let us know in that discussion if you have additional questions. 
GitHub
Retiring Redis Namespaces · mastodon/mastodon · Discussion #34198
Background Mastodon has supported using a dedicated namespace for keys in redis for a long time. The idea was that several applications (or instanc...