Change:
fs.IPVar(&s.BindAddress, "bind-address", s.BindAddress, ""+ "The IP address on which to listen for the --secure-port port. The "+ "associated interface(s) must be reachable by the rest of the cluster, and by CLI/web "+ <del> "clients. If blank or an unspecified address (0.0.0.0 or ::), all interfaces will be used.") </del> <ins> "clients. If blank or an unspecified address (0.0.0.0 or ::), all interfaces and IP address families will be used.") </ins> desc := "The port on which to serve HTTPS with authentication and authorization." if s.Required {

Discussion:
The docs are ambiguous on whether a socket will be limited to either the IPv4 or IPv6 address familiy. E.g., contains This wording in bold suggests that when is 0.0.0.0, the API server will listen on IPv6 addresses too, potentially. That would be incorrect and prevent limiting the address family from the config (to enforce single-stack). According to a report to me, indeed this incorrect behavior is the case. In any case, the wording is ambiguous. Moreover, the source code base contains quite a few literals that aren't accompanied by , suggesting that IPv4 is assumed in some paths. Unless ... Kubernetes has this special algorithm that equates either {0.0.0.0} or {::} with {0.0.0.0, ::}.
See:
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that code is used to discover the advertised address if that is not provided, the family of the IP is used for the discovery. The bind address is passed as is to the listener and in golang, 0.0.0.0 and :: behaves the same, it opens a socket in all the addresses in the host The doc is correct
The docs are ambiguous since the behavior rather than being logical, relies on a Go-based implementation detail.
I can't understand why do you consider it ambiguous if that defines exactly what is going to happen. yeah, sometimes this happens unfortunately, but we can't do much about it without breaking compatibility, can we?

All interfaces could mean all interfaces for the specified address family, or all interfaces across address families. The latter is bizarre (non-standard and unproductive), but the actual behavior. What Go does and that Kubernetes exposes this behavior to the user without modification should be documented.
How do you word it then?
Can you explain where the difficulty is in reading and interpreting my comments? For me, it can't be any clearer.
lol, sorry, now I got it, I was confused because I remembered to change some of them to clarify exactly this and I was not realizing this flag was not correct. It is my fault , I honestly don't know why omitted the IP families but you are right, my apologies again , it was some kind of frequency illusion or bias. This is a good first issue for someone that wants to do a contribution to the project, just update this line I think is easy to understand and is coherent with the other flags /help /triage accepted
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I suggest then:
/assign
Hi, I see that there are another instances where "for listening in all interfaces and IP families" appear, like in: I am thinking to include them along with the change on "" file when submitting a PR WDYT?