In Visual Reports it is possible to create a report displaying bug trends or dynamics: count of opened vs closed bugs over particular time period.
The report can be grouped by high-level planning entity such as Sprint (Iteration), Release, Feature, Epic and Project.
Here is how the report can be built:
Data Source: Bugs
X axis: WEEK(CreateDate) and WEEK(End Date)
You can group entities by DAY, WEEK, MONTH and YEAR on X axis.
Y axis: Count of records.
Trends in the report can be additionally grouped by high-level planning entity. For example, it is possible to split bugs by release. We'll add Release field to Y axis for this purpose.
You can use Line or Stacked Bar mode for your chart. Here is how Stacked Bar chart looks like for the same data set:
In order to filter data by Create Date, End Date or high-level planning entity you're welcome to append Filter to the data source.
Examples of Filters:
?CreateDate >= '01-Jan-2017' ?EndDate >= '01-Jan-2017' ?Release.Name.Contains("3.8")
More info on filters: