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This information is from Logcat.
If you open your project in Android Studio and open the Logcat tab, you will see that every second thousands of messages will be generated, which are related to everything that is occurring on your phone.
Illustrative image
As can be seen in the image above, when debugging my project AS only filters messages from my project com.example.sales_catalog. It is also so that Flutter identifies the Exceptions and related message.
In relation to the code I/Flutter (22742), this code between parentheses is kind of the code related to that process that Flutter is listening to, in case your project is debugging