This app plots an area chart of stories and defects matching specified keywords. The chart shows a trend over time, and the granularity of the x-axis is totally configurable (month, release, quarter, etc.). The data is crazy filterable thanks to the built-in advanced filtering component, and you can export your data for finer inspection too.
The app is installed as a Custom HTML App (see help documentation) Once the app is installed, use the gear menu on the app panel and select "Edit App Settings".
Enter a comma separated list of the keywords you'd like to search for.
Pick how to aggregate the data- by count or plan estimate total.
Pick the timeframe for which to generate values along the x-axis. Available options include month, quarter, release and year. Data will be bucketed based on accepted date (or release, if selected).
In addition to the advanced filtering component in the app, you can write your own complex filter queries. Extensive documentation is available. This might be useful if you want to always limit the chart to certain complex criteria.