def copy_issue_tracker(app, old_app)
        return unless old_app["issue_tracker"]
        issue_tracker = app.build_issue_tracker
        copy_attributes_with_mapping(ISSUE_TRACKER_FIELDS_MAPPING, old_app["issue_tracker"], issue_tracker)
        app.issue_tracker.type = normalize_issue_tracker_classname(old_app["issue_tracker"]["_type"])