Change approvals in our monorepo are managed via [GitHub CODEOWNERS](https://help.github.com/articles/about-codeowners/) and are configured via the `.github/CODEOWNERS` file.
Once a change has all the approvals either the last approver or the PR author (if PR author has the project collaborator status) should mark the PR with `PR: merge` as well as `PR target: *` labels.
This signals to the caretaker that the PR should be merged. See [merge instructions](../CARETAKER.md).