A meeting where a team looks back on a past period of work so that they can learn from their experience and apply this learning to future projects is popularly known as?

During a backlog refinement meeting, a senior team member raises a concern about an epic sizing that requires the use of a new interface for a vendor product. The product owner acknowledges this as a risk.
What should the product owner do now?

When facilitated and managed well, the primary benefits of a project retrospective should be to:

In which meeting do you capture lessons learned?

The Scrum Master is a participant in the Sprint Retrospective.