We have a long-running project, where some of the components are no longer relevant (e.g. they were archived, merged, or discarded).
However, we prefer not to delete these components, since we might still need to relate to their corresponding issues.
Hence, we would like to have a way to mark such components as 'obsolete'. This means that:

• they won't be available in the 'Components' field when creating an issue (perhaps also when updating an existing issue).
• they will be available when filtering.
• they will appear separately (or struck-through) in the Components tab of the project.