You are correct, the only insights available with the App Engine Main API is the actual usage of the API as seen in the Quotas page <http://console.cloud.google.com/appengine/quotadetails>.
If you want to receive more analytics and insights for the emails you send, you can use third-party services like SendGrid <https://cloud.google.com/appengine/docs/standard/?hl=en_US&_ga=1.119369738.209804962.1476105735#mail>. SendGrid can add hidden images and tracking tags to links in your emails in order to record more detailed information about how your emails were accessed. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/b55c1c26-a3ee-4a27-a91e-38fb1f738ea8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
