For most software teams bad quality is the biggest waste and very often a root cause for delays. The problem statement is then how do you know if a team or project have bad quality? A good report for that is bug density. It measures bugs divided with issue output (issue count or story point). So a bug density of 50% means that for 10 issues/story point delivered there is 5 new bug created.
Different team have different bug density depending on a number of factors. Below team is averaging at 22%.
In the bug density report each bar is clickable to show detailed information on all bugs and done issues.