An Agile Team collects the Iteration Metrics they have agreed upon during which part of...

 An Agile Team collects the Iteration Metrics they have agreed upon during the quantitative part of the team retrospective. This is the part where the team assesses whether they met the Iteration Goals using a binary (yes or no) measure, and reviews the metrics that provide visibility and insight into the team’s performance and process improvement. Examples of Iteration Metrics include flow metrics, such as flow velocity, load and distribution, defects addressed, and automated test coverage. The team uses these metrics to identify trends, patterns, and areas for improvement, and to inform their qualitative feedback and improvement stories. References: Iteration Retrospective - Scaled Agile Framework, Metrics - Scaled Agile Framework