For questions about the timeline view of questions, accessible via "/posts/xxx/timeline" on any site.
Report bugs or ask for feature requests regarding the timeline view, but keep in mind it's not normally hyperlinked for anyone but ♦ moderators to begin with, hence it would usually be lower priority.
URL to the timeline of a post is of the form
https://$site/posts/[post ID]/timeline, e.g. https://meta.stackexchange.com/posts/3122/timeline