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The report shows how many unresolved issues currently are by components and priorities.
How to build it
To build this report start with table view and in the Measures dimension select measure Issues due and unselect default measure Issues created. Measure Issues due (or unresolved) issues do not have resolution and resolution date. On the Time dimension they are grouped by issue due dates (if the issue does not have a due date then it will be counted only in All Times member and won't be visible if a particular Time period is selected).
In the report Rows, select the Project dimension and select Component level.
In the report Columns add the Priority dimension and select Priority level. To eliminate components and priorities that are not used (there are no issues in this component and priority), select Hide empty rows and columns.
Then switch to the Bar tab and select in toolbox option Stacked to show a composition of priorities per component.