Hello,
In Kanban, you can use the boards throughput to estimate future projects based on future data. The throughput is measured in issues/day.

For instance, if you know that your team has an average throughput of 0.5 issues/day and you have 10 issues to deal with, you can make a good estimation by saying that it would take 10 * 0.5 = 20 days. For a better estimation, you can also consider your bug/feature ration (the average number of bugs you introduce for every new feature). So if you have bug/feature ratio of 0.4 and you have 10 features to add, you should in fact count 14 issues.

So the feature would be the following:

• On the Kanban board report's, dislay the current values and the historic for the rolling average throughput, a bit like in the current control flow chart for Kanban boards. The throughput should be calculated based on the time it takes for an issue to cross the board, like cycle time.
• Also display somewhere the bug/feature ratio on the same page.

Before moving to Jira we were calculating the throughput based on our post-it notes and it proved to be a very valuable tool. I am missing this in Jira.

Let me know if you have any question.

Thanks!