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Number of Issues in Backlog (out of Sprints) but Already Completed helps to point out loss in a sprint velocity. Expected  The expected metric value is equal to zero0.

How metric works

Chart overview 

Chart shows a number of completed backlog items without an assignment to a sprint - number in the center. Target value is above the chart.  

By click on a chart a pop up appears with the following information got from the task tracking system: 

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