The chart requires a milestone be selected. Filtering by Team is
This dashboard makes no attempt at predicting bug close rate; there is not enough
information in any one (or few) milestones to get reasonable estimates.
However, a simple grey line is provided that shows an ideal burndown
from the current remaining work down to zero at end of the milestone.
Use it as you see fit.
The new/closed bugs per day statistic includes all the bugs added to
the milestone at the beginning, and removed at the end (provided it
happens inside the time window). If you are viewing multiple
milestones the number may be artificially large.