Guestbook was originally a Kubernetes example application, which has been modified for use as a Preview example.
Note that there are 2 difference examples on different branches of this repository.
The guestbook application contains a single application, and a Redis dependency in a master/slave configuration.
In this example, we have a Helm chart for deploying the main application, and use Kubernetes manifest files to deploy the Redis dependency.
You can see in this example that we actually do not have any content in our config.yaml file. This is because we are just deploying the manifests from the .preview/manifests/ directory, and applying the default chart-values file by name.