We've released an improvement to the way we handle environment variables when deploying a brand new application. We will now clearly show the environment variables that we have detected your application needs, and will auto-create, if you choose to deploy your databases via Cloud 66 (i.e. if you're not hosting your databases externally).
If you are hosting your databases externally, we will no longer create the corresponding environment variables unless you override our values by importing new values from a file, or by adding them manually via the UI. See our help documentation for additional information.