The Active Defect Charts app helps you visualize the currently active (not closed) defects using two pie charts.
If you want to start using the app immediately, create an Custom HTML app on your Rally dashboard. Then copy App.html from the deploy folder into the HTML text area. That's it, it should be ready to use. See this help link if you don't know how to create a dashboard page for Custom HTML apps.
Or you can just click here to find the file and copy it into the custom HTML app.
This app abides by the project scoping control and deals with customer modifications of the Severity and Priority fields.
You're free to customize this app to your liking (see the License section for details). Since this app uses a very old version of Rally's SDK, the app is only presented in its deployed form.
ActiveDefectCharts is released under the MIT license. See the file LICENSE for the full text.