We will document what the various buttons on the Task Annotations page mean, and the difference between a Suspected Issue and an Issue, from Evergreen's perspective. The precise criteria that differentiate these two is set by users of the Task Annotations UI/API (e.g., DAG), so this documentation will not include details on that.
The "Task Annotation" tab has some useful information in it but it's a little hard to find and digest. It looks like our wiki page is outdated and doesn't describe this page. Possibly we should split out a broader ticket to refresh that if there isn't one already.
I'm specifically interested in having a reference around what "Known Failure" is and how it's computed. I have a hypothesis that it's related to the confidence score > 0.95, but I wouldn't know where to look to dig into that.