How does YarnParameter attribute work?

[heshuimu]

For context, I'm trying to attribute YarnCommand onto a method that has an enum type parameter.

The documentation only has the type reference of YarnParameter, but does not demonstrate how it can be used. The change log does have a mention of YarnParameter, but it's only mentioned to work with Component types.

I then tried to survey the YarnSpinner source code and see where the attributes are being reference, but I could not find any usages.

So, how are YarnParameter attributes used in the code?