I was checking stuff in Google Search Console and I see a filter in the search appearance filter within the performance report for Android apps. It seems it is showing data from March 29th. I've never seen that filter there before but it seems to be there now.
Here is a screen shot, click to enlarge:
In the Google docs for search appearance filters - Android app is not listed there. What are listed include AMP article rich results, AMP non-rich results, event, Google Play Instant, job listings, job details, media actions, rich result, search result link and web light result.
So I guess this may be a new filter to show Android apps that lead to this? I am not sure if this is the Search Engine Roundtable app or other apps that cause this data to show?
Forum discussion at Twitter.
Update: Google just posted after this story went live - I pinged John Mueller about it, and they posted on Twitter that this is a new feature for sites that have Android apps associated sites their web sites - like we do.
Do you have an Android App associated with your website? 👉 In Search Console you can now see the app's clicks, impressions, CTR, and position with a separate search appearance in the Performance report.
— Google Webmasters (@googlewmc) April 8, 2019