For questions about the timeline view of questions or answers, accessible via "/posts/xxx/timeline" on any site or using the clock icon.
Report bugs or ask for feature requests regarding the timeline view. To access the timeline, click on the clock button (on the left, as explained in this answer.
There used to be no direct link to the timeline (only for ♦ moderators), this feature was implemented in January 2020.
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