I am requesting the exception for the feature "Add ability to inject
routes in interfaces.template".
The potential changes in Nova are limited as the feature is opt-in.
The default interfaces.template is not changed for the reasons now
explained in the new commit message. No comment were made so far
requiring code refactoring, only ones about procedural technicalities.
Furthermore, this code has been running in a production environment for
months without any issue.
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