[Announcement] Decoupling SDK framework to sigs.k8s.io/apiserver-runtime

[yue9944882]

both this repo and kubebuilder are founded to address the pain-points in developing extensions for kubernetes. by kubebuilder's philosophy, to reduce the "heavy" code-generation and copy-pasting, an SDK framework dedicated for developing kubernetes controller named controller-runtime was incubated and now getting mature and popular in the community. to follow the success of controller-runtime we're incubating an SDK framework for developing aggregated-apiserver named apiserver-runtime to similarly pack the complexity of underlying kubernetes sources into a user-friendly layer of abstraction. w/ the help of the new apiserver-runtime, we're even capable of minimizing the source of an aggregated apiserver to one line.

we will be migrating onto this new SDK framework together w/ bumping k8s dependencies to 1.19. it will be breaking some compatibility for existing repos but we will provide a document for doing the manual migration to make it work. the good news is that the interfaces from apiserver-runtime will be fairly intuitive and hopefully we can share the joy of landing onto the new runtime 🙂.

besides getting rid of code-generation, we will also promote the extensibility of custom storages into the new runtime, e.g. mysql storage is already landed and there will soon be more packages supporting more kinds of storage layers..

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