TL; DR: Data-Informed Retrospectives
In their book Agile Retrospectives, Esther Derby and Diana Larsen popularized the idea that a Sprint Retrospect comprises five stages. The second stage refers to gathering data so that the Scrum Team can have data-informed Retrospectives.
As I have observed in practice, many Scrum Teams either limit the data gathering part of the Retrospective, thus lacking vital information. Or they invest too much time doing so, leaving little capacity to analyze the data and come to conclusions on how to best improve as a team.
Read on and learn how you can avoid falling victim to both scenarios by gathering data continuously and asynchronously.