Set default issue labels via issue description template when used by guest user
### Problem to solve Allow issue description templates to set the default set of labels an issue is opened with. ### Intended users Project maintainers ### Further details Often open source projects have a few types of issues, each with their own issue description template and distinguished by a label. For instance, the GHC deployment (gitlab-ce#55039) has: * Bugs, with an issue template and distinguished by the `bug` label * Feature requests, with an issue template and distinguished by the `feature request` label Ideally the issue template would contain `/label` commands to apply the appropriate labels. However, such commands have no effect on issues opened by guest users, who lack the necessary privileges to manage labels. Consequently these labels must currently be applied manually by the ticket triagers. ### Proposal The issue description template be extended to include a header (e.g. using the [common YAML header syntax](http://pandoc.org/MANUAL.html#extension-pandoc_title_block#extension-yaml_metadata_block)). To this a `default_labels` field can be added, specifying the default labels to be a applied to an issue created with the template. For instance, the `bug.md` template might look like: ``` --- default_labels: - "needs triage" - bug --- # Summary Write a brief description of the issue. # Steps to reproduce Please provide a set of concrete steps to reproduce the issue. ... ``` ### Permissions and Security Only committers can edit issue templates and consequently allowing this sort of access to labels to unprivileged users should be safe. ### Documentation The header format would need to be documented. ### What does success look like, and how can we measure that? Triage effort is reduced. ### Links / references
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