Revert "Remove HipChat integration from GitLab" (!10677) · Merge requests · GitLab.org / GitLab · GitLab

Sean McGivern requested to merge restore-hipchat into master Apr 09, 2019

This reverts https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9458. It's the EE counterpart of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/27172.