They've had serial output for a while now and one problem with this new version of it is that you can only get the output that is produced while you are actually connected to it. So if you'd like to see output from say yesterday - it's not going to happen.

Google Cloud will store this info (even after reboot) for a while.

Azure is probably the best at dealing with this as they can take both screenshots and dump text continuously into a bucket of files so you can always have everything available.