The 'Wall' feature has been removed in GitLab 7.0. Existing wall comments will remain stored in the database after the upgrade.
## Global issue numbers
As of 6.1 issue numbers are project specific. This means all issues are renumbered and get a new number in their URL. If you use an old issue number URL and the issue number does not exist yet you are redirected to the new one. This conversion does not trigger if the old number already exists for this project, this is unlikely but will happen with old issues and large projects.