We have a [doc](https://docs.google.com/document/d/1BS_GR1nmZQPrtaGKmAV3nSicJFRhqhC2WhvhCxBZav8/edit) that describes new variables and events for analytics in `amp-story`. We should fold that into the [amp-analytics documentation](https://www.ampproject.org/docs/reference/components/amp-analytics) or the [amp-story documentation](https://github.com/ampproject/amphtml/blob/master/extensions/amp-story/amp-story.md). /cc @bpaduch
We have a doc that describes new variables and events for analytics in
amp-story. We should fold that into the amp-analytics documentation or the amp-story documentation./cc @bpaduch