What happened?

It looks like default HTTPS port for kube-scheduler has changed from 10251 to 10259 between 1.22.4 and 1.23.0 releases and it has not been mentioned in the changelog.

I1208 11:30:46.202095       1 deprecated_insecure_serving.go:54] Serving healthz insecurely on [::]:10251

I1208 09:17:41.523334       1 secure_serving.go:200] Serving securely on [::]:10259

EDIT: Actually, I see now that 1.22.4 listens on 10259, but also on 10251 and 1.23.0 just stopped listening on 10251.

What did you expect to happen?

Breaking changes to be included in the changelog.

How can we reproduce it (as minimally and precisely as possible)?

With kube-prometheus-stack installed, with kube-scheduler scraping configured, upgrade kube-scheduler from 1.22.4 to 1.23.0.

Anything else we need to know?

No response

Kubernetes version

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.4", GitCommit:"b695d79d4f967c403a96986f1750a35eb75e75f1", GitTreeState:"archive", BuildDate:"2021-11-18T21:20:32Z", GoVersion:"go1.17.3", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.0", GitCommit:"ab69524f795c42094a6630298ff53f3c3ebab7f4", GitTreeState:"clean", BuildDate:"2021-12-07T18:09:57Z", GoVersion:"go1.17.3", Compiler:"gc", Platform:"linux/amd64"}

Cloud provider

OS version

# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here

Install tools

Container runtime (CRI) and and version (if applicable)

Related plugins (CNI, CSI, ...) and versions (if applicable)