I’ve already seen that document.
However, there was no description of a monitoring service (by SingleStore Inc.) like option #1.
Is this service discontinued now?
The cloud-based monitoring service that you asked about is for paying customers only. If you want to get started with that, you can contact our support team.
You can self-host monitoring as described in these instructions:
Fully cloud-based monitoring is available for SingleStore Managed Service customers.