If you have separate stacks for each application instance why wouldn't a separate instance of Redis be part of that stack too? Do you really want some buggy cod

If you have separate stacks for each application instance why wouldn't a separate instance of Redis be part of that stack too? Do you really want some buggy code overloading test-redis and bleeding into production? More generally, you can always use key-prefixes if you want a name-based way to segregate data in the same redis+db instance.