Follow-up from "Enable sidekiq-cluster by default"
The following discussion from !4140 (merged) should be addressed:
https://docs.gitlab.com/omnibus/development/adding-deprecation-messages.htmlYou're already doing this later.
We need to document it better I think. But we do provide a method for printing out a message when deprecated attributes are used. See deprecations.rb
The libraries/deprecations.rb file is not well documented. We should add it to the developer documentation