We introduced the new PRODUCTION setting in order to add a separation between things which enable debug logging, and things which should always be enabled (or disabled) in production vs. in the devserver. This was done because a lot of server admins like to set DEBUG to True if they're having some issue, and this would often cause their whole system to break. In Djblets, we can't guarantee that PRODUCTION will exist in the settings object. This change makes it so we fall back to the DEBUG setting if it's not present. Testing Done: - Ran unit tests. - Tried removing PRODUCTION from settings and saw that these things still worked.