Root Cause Analysis Report
Step 1: Add a data source encompassing resolved bugs from the time period you wish to analyze.
Step 2: Keep the default metric selection as ‘Number of issues’.
Step 3: Display by ‘Root cause’ field.
Keep in mind this field ‘Root cause’ is a custom field. Instructions on how to configure this field and start gathering data for Root cause (RCA) report from your Jira read this blog article.