Thanks for your response :)!

1. Do you happen to know if metrics are based on changes, like state changes or can metrics be based on anything?

2. In order for the metric to work, do we need to determine what the previous state was? In other words, we are also trying to get the total duration of the story from start to finish, but during the time that it is open it changes states. Is it important to know all the state change durations to calculate the total story duration?