A customer's technical lead described a new feature to the project manager. Believing it will significantly boost performance, the project manager added it as a high-priority item in the sprint backlog. By sprint end, not all planned stories were completed because the new feature consumed more time. What should the project manager do next?

The Product Owner is responsible for maximizing the value of the product and managing the Product Backlog, including prioritizing items. The project manager should have discussed the new feature with the Product Owner first to assess its value and impact before adding it to the sprint. Adding it directly to the sprint backlog without Product Owner approval bypasses this critical role and can disrupt sprint goals, as seen in this scenario. Modifying or deleting stories in the current sprint backlog without Product Owner input is also incorrect. Negotiating with the Scrum Master is not the primary step for adding new features; the Scrum Master facilitates the process but doesn't own the product backlog.