I want to create a chart showing stories created by week. Rather than using 'issues->created at', I want to count when issues have transitioned issuetype to 'story'. This should count new stories created that week as well as other things like questions or tasks that started out not as stories some time int he past but changed to be story. I want to count these transitions from other types to story as created at the week when the transition happens. Is there a way to use issue history? I tried looking at issue history field but I don't see a transition history for my change from 'question' to 'story'.