<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=39212) </details> <!--IssueSummary end--> ## Description There's a number of places in our admin settings where URL's are being set. If they use a `http` URL, they could be exposing their GitLab instance to security issues. We should be kind enough to warn them. :smile: **What URL settings does this apply to?** - Plant UML - Sourcegraph - ... ## Context Here's the [comment where this was brought up](https://gitlab.com/gitlab-org/gitlab/merge_requests/20512#note_258214965).