REPORTS: Missing data in Chart

Document ID : KB000092914
Last Modified Date : 25/04/2018
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Issue:
Occasionally, a user might find a chart has a gap in the data displayed. For example:

User-added image
Cause:
​There are two reasons why a chart has missing data:
  1. Something happened when the system ran the data collection, therefore, it does not show data during those days.
  2. Iteration/Release Date changed. For example, the original Release end date is 2018/03/31, but the end date changed to 2018/04/31 on 2018/04/15. So the system did not collect any data from 2018/04/01 to 2018/04/15. Now, after 2018/04/16, the user will see a gap in the charts since it missed collecting data during 2018/04/01 to 2018/04/15.
Resolution:
Create a support case, and if possible, the support team will re-run the data collection job to retrieve the data. However, if the date was changed, as in the example in number two above, support will not able to fix this because the data collection job needs to run every day in order to build the chart. 
Additional Information:
keywords: missing data; burndown chart, burnup, missing days, data collection, data repair