We've worked with our customers' feedback to develop metrics that reflect the Pull Request Velocity. You can now visualize the average duration for each step of the pull request cycle. 

We also built quantitative pull request metrics, such as the number of pull requests merged without rebasing, the number of pull requests merged without review, and more.

You can find the Pull Request Velocity metrics in the Developer Performance, Team Performance, and Repositories Stats reports. Click on the Pull Requests Stats button to toggle the Pull Request Velocity metrics.