ambassador module defaults

apiVersion: getambassador.io/v3alpha1
kind:  Module
metadata:
  name:  ambassador
spec:
  config:
    defaults:
      class1:           # This is a class. Different resource types will look in different classes.
        key1: value1    # Within a class, you can set different keys.
        key2: value2
        ...
      class2:
        ...
      top_key1: value1  # If a key isn't found in a resource's class, the system will look in the
      top_key2: value2  # toplevel defaults dictionary for it.