@Override
    public void validate(Context context) {
        if (context.deployState().isHosted() && context.model().getContainerClusters().isEmpty())
            context.illegal("Vespa Cloud applications must have at least one container cluster");
    }
Validates that a Vespa Cloud application has at least one container cluster.

@author jonmv
config-model/src/main/java/com/yahoo/vespa/model/application/validation/ContainerInCloudValidator.java