Bot for ensuring the we use only one of the labels within the scope
GitLab Premium has a feature called scoped labels, which allows only one label from a given scope to be set on an issue.
Scopes are prefixed with scope_name::.
With bug migration from bugzilla to GitLab we followed this notation whenever applicable hoping that this feature would eventually end up in community edition.
In the meantime we can create a bot that periodically queries issues looking for such conflicts and then resolves them by dropping all but the most recently applied label from a given scope.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information