Here are the steps to send a Bug Report from the Karoo:
Pre-requisite: Enable Developer Options on the Karoo
On the main screen, tap on the "Settings" app.
Scroll down and choose "Developer Options".
Toggle USB Debugging to "ON".
Toggle Bug report shortcut to "ON".
On any screen, press and hold the Power Button. You will see this popup.
Tap on "Take bug report"
This will send us a complete bug report.
There wouldn't be any notification that a bug report has been sent from your device.
Note: A bug report is not uploaded over 3G, it is uploaded only when there is a WiFi connection. So, if you take a bug report while you you are without internet connection, it will be uploaded as soon as your Karoo is connected to Wi-Fi.