Add the ability to lock a milestone
Problem to solve
Currently I (and every team member) can add issues and merge requests to a milestone unless it it deleted. If a milestone is planned and scheduled I can't lock the milestone so no additional issues and merge requests could be assigned. Close the milestone be a solution because for me that's the indicator for done.
I would like to have the ability to lock a milestone. It should not be possible to add issues and merge requests to a locked milestone. Unless you are a manager or owner of a project.