Hello, we consider using the self-hosted version of growthbook but we can not find any information if the docker container is capable of operation on multiple nodes when it will scale. Does anybody have information on that?

The GrowthBook container is stateless, so you can horizontally scale it behind a load balancer without issues.

and where is the state handled then?

In the MongoDB database

Okay because the docs state

In addition to the app itself, you will also need a MongoDB instance to store login credentials, cached experiment results, and metadata.

we thought this does not include feature toggles 🙂