To use the Issues Over Time Report, click Reports (1) and Classifications Over Time (2).
NOTE: The graph will auto generate as you select your variables.
When hovering over a point, the Issue will be highlighted. A pop-up also appears, displaying the Issue name and how many times it has been reported for that month. This helps you differentiate between your Issues easily. See below (5).
When you click the Issues in the Graph Legend (6), the word is greyed out and won't being displayed in the Issue Over Time Chart. This allows you to remove Issues you are not interested in and create a more refined graph.
Want to learn more about the Issues Over Time Report ? Click here.