-`POST /projects/:id/trigger/builds` to `POST /projects/:id/trigger/pipeline`
- Require description when creating a new trigger `POST /projects/:id/triggers`
- Simplify project payload exposed on Environment endpoints [!9675](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9675)
- API uses merge request `IID`s (internal ID, as in the web UI) rather than `ID`s. This affects the merge requests, award emoji, todos, and time tracking APIs. [!9530](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9530)
- API uses issue `IID`s (internal ID, as in the web UI) rather than `ID`s. This affects the issues, award emoji, todos, and time tracking APIs. [!9530](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9530)