Diagnostic Summary Pane
Displays the number of diagnostic code issues found in the solution. The number in the doughnut's center is the total number of issues found. Each sector's value indicates the number of errors, warnings, info issues, or hidden issues.
The pane also includes the following links:
Error reports
Shows all issues of type Error.Warning reports
Shows all issues of type Warning.New reports
Shows the new issues.New error reports
Shows new errors found (since the baseline).