In the [GraphQL API](https://docs.gitlab.com/ee/api/graphql/), the `external` field of [`ReleaseAssetLink` type](https://docs.gitlab.com/ee/api/graphql/reference/index.html#releaseassetlink) was used to indicate whether a [release link](https://docs.gitlab.com/ee/user/project/releases/release_fields.html#links) is internal or external to your GitLab instance.