It is a debugging tool for measuring simple network traffic.
Under the Hood is a flexible and powerful Android debug view library. It uses a modular template system that can be easily extended to your needs, although coming with many useful elements built-in.
There is a lot of "default" debug data that can be easily embedded (e.g. current runtime-permission status, app version and device info). There are 2 basic themes (dark and light) which can be customized to your needs.