I would use the docker only for testing things like build own mkp’s where i need a clean setup.
Docker containers have a very big problem to react quick if you need more resources from one second to the next. And this is the typical things happen inside a monitoring instance. At the moment it does nothing and at the next moment you want to check 10 hosts parallel. This will not work in a container setup.
Productive systems are VMs for smaller installations, VMs with dedicated host for bigger things or real hardware for really big installations 