Epic comment thread
gitlab-ce!15732 (merged) needs to be merged before this can be completed.
- Comment/discussion thread in an epic.
- Same design/implementation as issues and merge requests.
- Includes threaded discussions (same as issues).
- Additionally, the requirements for system notes in epics in these issues will be displayed after this issue is implemented. We should test these. #3947 (closed) #3853 (closed)
- None yet