An issue was discovered in GitLab Community and Enterprise Edition before 10.8.7, 11.0.x before 11.0.5, and 11.1.x before 11.1.2. Information Disclosure can occur because the Prometheus metrics feature discloses private project pathnames.
https://gitlab.com/gitlab-com/infrastructure/issues/4423
https://about.gitlab.com/2018/07/26/security-release-gitlab-11-dot-1-dot-2-released/