name can be too long for some feature branches, makes sure it's as short as possible

Just another use case to test. This is supposed to be the desired
mode for core-middleware, so we should at least have this tested as
chances are high that admins want to align on the redis deployment.

UI Middleware instance for prefix deployments was not restarted, so deployment could be "old".
Online help was broken for prefix deployments, adjusted virtualservice to match deployment