Code change:
"description": "Endpoint represents a single logical "backend" implementing a service.", "properties": { "addresses": { <del> "description": "addresses of this endpoint. The contents of this field are interpreted according to the corresponding EndpointSlice addressType field. Consumers must handle different types of addresses in the context of their own capabilities. This must contain at least one address but no more than 100.", </del> <ins> "description": "addresses of this endpoint. The contents of this field are interpreted according to the corresponding EndpointSlice addressType field. Consumers must handle different types of addresses in the context of their own capabilities. This must contain at least one address but no more than 100. These are all assumed to be fungible and clients may choose to only use the first element. Refer to: https://issue.k8s.io/106267", </ins> "items": { "default": "", "type": "string"

Related discussion:
text: An can contain up to 1000 , which can each contain up to 100 . Or at least, that's what the docs say, but actually, kube-proxy (or more specifically, ) only looks at the first Address in each Endpoint: (This is compatible with how works, since it would only generate multi-Address Endpoints if a pod had multiple of the same address family, which is not allowed. But it's not compatible with manually-generated EndpointSlices.) Either all are used, or else the docs state that only is used and the field is an array solely for historical reasons.
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/sig network /priority important-longterm /cc
All addresses in the slice must be of the same type, do you mean creating an Slice with different address types in the Addresses field?
I'm not sure if/how kube-proxy should handle an endpoint with more than 1 address. I think the goal of kube-proxy is to give each endpoint an equivalent probability of being selected. To extend that logic here, I think we'd need to take the probability assigned to an endpoint and divide it by the number of addresses attached to that endpoint. So if an endpoint has a 50% probability of being selected, and it provides 50 addresses, each should end up with a 1% probability of being selected. Of course with the way we need to do descending probabilities, the logic may get a bit complicated. This isn't as clear as it should be, but I don't think kube-proxy or any consumer of the EndpointSlice API needs to commit to supporting every value specified by that API. For example, many may filter by address type, Service, or some other means. I think it's also valid for a consumer to say they only support a single address per family per endpoint. So all of that to say, I'd support either documenting that kube-proxy only selects the first address in an endpoint, or updating kube-proxy to support more than one address per endpoint.