Defining Nested Data in Response Schema

You should add 'type: object' to the internal items array:

        items:
          type: object
          additionalProperties:
            type: object
            properties:
              ModuleName:
                type: string
                example: latency
              ModuleSettings:
                type: string
                example: Min 0, Max 10

While the definition is valid, itt doesn't actually produce the result you'd expect. When you don't specify a type, it means that any type can be used (string, array, object, number...). The 'additionalProperties' will only take effect if the actual used value is an object, but in other cases it will be ignored. Having that definition does not implicitly set the type to be object.