Eventually we’ll split this page up and put each description against each specific system’s documentation.
Azure DevOps
Supported but not visible in the user interface. User voice on this issue is here: Show whether commits are verified with GPG key on UI - Developer Community (visualstudio.com)
Bitbucket Cloud: WIP for BB Cloud (BB-319)
Bitbucket Data Centre: Available using a Commit Hook (Using GPG keys | Bitbucket Data Center and Server 8.11) but not indicated on UI (as it’s implied that all commits must be signed)
GitHub: Supported, and indicated in the UI (see above) Signing commits - GitHub Docs
GitLab: Supported, and indicated in the UI Sign commits with GPG | GitLab