What is the common spec for Knative? It seems like one runs an app as normal in a container and then the special scaling sauce is handled by Knative.

When I think of a portable spec for serverless, I think of something more like a Trait of an Interface that needs to be implemented, less a app hosting model. If you think about it like that, then Web Assembly component model [1] would be a great fit for defining an interface that could be implemented in a variety of languages.

[1]: https://github.com/WebAssembly/component-model/blob/main/des...