Creating a Group Metric allows you to track progress along with your group members. Setup is identical to an individual Metric, with a couple of exceptions. First, you can choose whether to include all or some group members. Second, you get to choose whether to combine the data of the metric as the sum or the average of the group's individual data points.

After adding the Group Metric, you can view it on the Group Stream. The graph represents the combined data of the included group members, presented as the sum or average.

Clicking the arrow towards the right brings up the included group members' individual graphs.