Change approvals in our monorepo are managed via [pullapprove.com](https://about.pullapprove.com/) and are configured via the `.pullapprove.yaml` 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" label.
This signals to the caretaker that the PR should be merged.