Click on the widget to open a detailed drill-down report stat shows the coverage for each file:
Red and green are used to highlight testable code that was changed between the baseline build and the target build. Green indicates that at least one test case covered the code. Red indicates that no test cases covered the code.
Instead of presenting code coverage data, the drill-down report may show N/A if one or more of the reports for the builds lacks proper resource information. Verify that the source-related settings for code analysis tool sending reports to DTP have been properly configured. See the tool’s documentation for additional information.