Hello!
I've been using the sprint Burndown chart under "reports" for my project. As we don't always estimate tasks, the most accurate measurement is by issue count, and I'll look at the sprint in progress to ensure we're on track.
Bugs in my project have two different status in the "done" category: Done (dev has submitted a fix) and Verified (QA has verified that the bug is fixed). When a dev moves it to Done, the burndown report logs that it was completed. However, when QA moves it to verified, the report marks it as reopened!? It has an Event Type of Burndown and an Event Detail of Issue Reopened in the log. (I cannot provide screenshots for security reasons, unfortunately). Any idea why this might be happening?