I came across it this afternoon in the WordPress Insights tab. The Insights tab gives Information regarding views to a particular post and where it is coming from. While going through the details, I found something that brought my attention.
I didn’t know what it meant so I did a research by going through some articles and found that com.google.android.gm refers to the Gmail App from Android. Which essentially means that someone had viewed a blog post by clicking on a link from their Gmail App on their Android phone.