| [Check API version](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#api-version-check) | :heavy_check_mark: | :heavy_check_mark: | Used globally to ensure that the registry supports the Docker Distribution V2 API, as well as for identifying whether GitLab Rails is talking to the GitLab Container Registry or a third-party one (used to toggle features only available in the former). |
| [List repository tags](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#listing-image-tags) | :heavy_check_mark: | :heavy_check_mark: | Used to list and show tags in the UI. Used to list tags in the background for [cleanup policies](../../../user/packages/container_registry/#cleanup-policy) and [Geo replication](../../../administration/geo/replication/docker_registry.md). |
| [Check if manifest exists](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#existing-manifests) | :heavy_check_mark: | :heavy_multiplication_x: | Used to get the digest of a manifest by tag. This is then used to pull the manifest and show the tag details in the UI. |
| [Pull manifest](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#pulling-an-image-manifest) | :heavy_check_mark: | :heavy_multiplication_x: | Used to show the image size and the manifest digest in the tag details UI. |
| [Pull blob](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#pulling-a-layer) | :heavy_check_mark: | :heavy_multiplication_x: | Used to show the configuration digest and the creation date in the tag details UI. |
| [Delete tag](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#deleting-a-tag) | :heavy_check_mark: | :heavy_check_mark: | Used to delete a tag from the UI and in background (cleanup policies). |
| [Check API version](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#api-version-check) | **{check-circle}** Yes | **{check-circle}** Yes | Used globally to ensure that the registry supports the Docker Distribution V2 API, as well as for identifying whether GitLab Rails is talking to the GitLab Container Registry or a third-party one (used to toggle features only available in the former). |
| [List repository tags](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#listing-image-tags) | **{check-circle}** Yes | **{check-circle}** Yes | Used to list and show tags in the UI. Used to list tags in the background for [cleanup policies](../../../user/packages/container_registry/#cleanup-policy) and [Geo replication](../../../administration/geo/replication/docker_registry.md). |
| [Check if manifest exists](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#existing-manifests) | **{check-circle}** Yes | **{dotted-circle}** No | Used to get the digest of a manifest by tag. This is then used to pull the manifest and show the tag details in the UI. |
| [Pull manifest](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#pulling-an-image-manifest) | **{check-circle}** Yes | **{dotted-circle}** No | Used to show the image size and the manifest digest in the tag details UI. |
| [Pull blob](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#pulling-a-layer) | **{check-circle}** Yes | **{dotted-circle}** No | Used to show the configuration digest and the creation date in the tag details UI. |
| [Delete tag](https://gitlab.com/gitlab-org/container-registry/-/blob/master/docs/spec/api.md#deleting-a-tag) | **{check-circle}** Yes | **{check-circle}** Yes | Used to delete a tag from the UI and in background (cleanup policies). |
A valid authentication token is generated in GitLab Rails and embedded in all these requests before sending them to the registry.
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@@ -211,22 +211,22 @@ This is a list of all the registry HTTP API operations and how they depend on th
| Operation | Method | Path | Requires Database | Requires Storage | Used by GitLab Rails * |
