Is Initializers part of the admission controller chain

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From this doc document: https://v1-16.docs.kubernetes.io/docs/reference/access-authn-authz/admission-controllers/.

An admission controller is a piece of code that intercepts requests to the Kubernetes API server prior to persistence of the object, but after the request is authenticated and authorized.

But this article says that

After an object is persisted to the datastore, it is not made fully visible by the apiserver or scheduled until a series of intializers have run.

[Léo Gillot-Lamure]

Hi.

It seems Initializers were an Alpha concept and were abandoned in this form (see kubernetes/kubernetes#72972).

However, don't mourn them, because their functionality is provided by a special Admission Controller called "MutatingAdmissionWebhook" (see beginning of this paragraph) !

That way, instead of a new, different concept, it's unified with Admission Controllers and that's one less thing to know :).