Labels allow you to categorize issues or merge requests using descriptive titles like `bug`, `feature request`, or `docs`. Each label also has a customizable color. They allow you to quickly and dynamically filter and manage issues or merge requests you care about, and are visible throughout GitLab in most places where issues and merge requests are located.
This functionality is demonstrated in a video titled [Use scoped labels in GitLab 11.10 for custom fields and custom workflows](https://www.youtube.com/watch?v=4BCBby6du3c).
If labels have multiple instances of `::`, the longest path from left to right, until the last `::`, is considered the "key" or the "scope".
For example, `nested::key1::value1` and `nested::key1::value2` cannot both exist on the same issue. Adding the latter label will automatically remove the former due to the shared scope of `nested::key1`.
`nested::key1::value1` and `nested::key2::value1` can both exist on the same issue, as these are considered to use two different label scopes, `nested::key1` and `nested::key2`.
Alternatively, you can create group labels also from Epic sidebar. Please note that the created label will belong to the immediate group to which epic belongs.
From the sidebar of an issue or a merge request, you can create a new **project label** inline immediately, instead of navigating to the project label list page.
If you are expanding from a few projects to a larger number of projects within the same group, you may want to share the same label among multiple projects in the same group. If you previously created a project label and now want to make it available for other projects, you can promote it to a group label.
From the project label list page, you can promote a project label to a group label. This will merge all project labels across all projects in this group with the same name into a single group label. All issues and merge requests that previously were assigned one of these project labels will now be assigned the new group label. This action cannot be reversed and the changes are permanent.
Every issue and merge request can be assigned any number of labels. The labels are visible on every issue and merge request page, in the sidebar. They are also visible in the issue board. From the sidebar, you can assign or unassign a label to the object (i.e. label or unlabel it). You can also perform this as a [quick action](quick_actions.md) in a comment.
From the project issue list page and the project merge request list page, you can [filter](../search/index.md#issues-and-merge-requests) by both group (including subgroup ancestors) labels and project labels.
From the group issue list page and the group merge request list page, you can [filter](../search/index.md#issues-and-merge-requests) by both group labels (including subgroup ancestors and subgroup descendants) and project labels.
From the group epic list page, you can [filter](../search/index.md#issues-and-merge-requests) by both current group labels as well as descendant group labels.
- From [project boards](issue_board.md), you can filter by both group labels and project labels in the [search and filter bar](../search/index.md#issue-boards).
- From [group issue boards](issue_board.md#group-issue-boards-premium), you can filter by only group labels in the [search and filter bar](../search/index.md#issue-boards). **(PREMIUM)**
- From [project boards](issue_board.md), you can filter by both group labels and project labels in the [issue board configuration](issue_board.md#configurable-issue-boards-starter). **(STARTER)**
- From [group issue boards](issue_board.md#group-issue-boards-premium), you can filter by only group labels in the [issue board configuration](issue_board.md#configurable-issue-boards-starter). **(STARTER)**
From the project label list page and the group label list page, you can subscribe to [notifications](../../workflow/notifications.md) of a given label, to alert you that the label has been assigned to an issue or merge request.
> - Priority sorting is based on the highest priority label only. [This discussion](https://gitlab.com/gitlab-org/gitlab-ce/issues/18554) considers changing this.
From the project label list page, star a label to indicate that it has a priority. Drag starred labels up and down to change their priority. Higher means higher priority. Prioritization happens at the project level, only on the project label list page, and not on the group label list page. However, both project and group labels can be prioritized on the project label list page since both types are displayed on the project label list page.
On the project and group issue and merge request list pages, you can sort by `Label priority` and `Priority`, which account for objects (issues and merge requests) that have prioritized labels assigned to them.
Ties are broken arbitrarily. (Note that we _only_ consider the highest prioritized label in an object, and not any of the lower prioritized labels. [This discussion](https://gitlab.com/gitlab-org/gitlab-ce/issues/18554) considers changing this.)
- Object's assigned [milestone](milestones/index.md)'s due date is sooner, provided the object has a milestone and the milestone has a due date. If this isn't the case, consider the object having a due date in the infinite future.
- Object with a higher priority prioritized label.
