Thank you for your answer. We are still only running Docker for development but will deploy to production in 6-9 months.
1. Nothing is set in stone but from what I hear from my users Kubernetes is the way things are going.
2. We will be running a backend web service using microservice architecture on Windows core.
3. Most likely we will have our owen monitoring and alert´. Site 24x7 is mostly used for monitoring the host servers and reporting on vitals.
4. No not in the current project.
We have another huge online system running on AWS in virtual machines - maybe in a couple of years this will be refactored to docker as well, in which case my answers to 3 and 4 will be different :)