[yocto] Yocto weekly bug trend charts -- WW09

[Xu, Jiajun]

Hi all,
This is latest Yocto bug trend chart for WW09. With developers' hard work, we have open bug number decreased a lot (from 160 to 131). And from this week, we introduce a new chart "weighted defect density", which could show overall bug status of project.

Note:
How we calculate the data of "weighted defect density"?
We define a weight for each severity. And the sum of these weights for all open bugs are the data we record in chart.
The weight we use for each severity:
Critical: 10
Major: 7
Normal: 5
Minor: 3
Enhancement: 1

Best Regards,
Jiajun
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