- Log messages in JSON format are written to stderr by default now (same as text format) instead of stdout. Users who expected JSON output on stdout must now capture stderr instead or in addition to stdout. ([#106146](https://github.com/kubernetes/kubernetes/pull/106146), [@pohly](https://github.com/pohly)) [SIG API Machinery, Architecture, Cluster Lifecycle and Instrumentation]

- Fixed performance regression in JSON logging caused by syncing stdout every time error was logged. ([#107035](https://github.com/kubernetes/kubernetes/pull/107035), [@serathius](https://github.com/serathius))

- Added a `Stream` field to `PodLogOptions`, which allows clients to request certain log stream (stdout or stderr) of the container.

- Client-go exec credential plugins will pass stdin only when interactive terminal is detected on stdin. This fixes a bug where previously it was checking if **stdout** is an interactive terminal. ([#99654](https://github.com/kubernetes/kubernetes/pull/99654), [@ankeesler](https://github.com/ankeesler))

- Update the system-validators library to v1.5.0. Includes validation for `seccomp` and fixes a stdout/stderr problem in the Docker validator. ([#103390](https://github.com/kubernetes/kubernetes/pull/103390), [@ironyman](https://github.com/ironyman))
- Updates the following images to pick up CVE fixes:
  - `debian` to v1.8.0

* A new flag "progress-report-url" has been added to the test context which allows progress information about the test run to be sent to a webhook. In addition, this information is printed to stdout to aid in users watching the logs. ([#84524](https://github.com/kubernetes/kubernetes/pull/84524), [@johnSchnake](https://github.com/johnSchnake))

pkg syscall (netbsd-arm64-cgo), type WaitStatus uint32
pkg syscall (netbsd-arm64-cgo), var Stderr int
pkg syscall (netbsd-arm64-cgo), var Stdin int
pkg syscall (netbsd-arm64-cgo), var Stdout int
pkg syscall (netbsd-arm64), const AF_APPLETALK = 16
pkg syscall (netbsd-arm64), const AF_APPLETALK ideal-int
pkg syscall (netbsd-arm64), const AF_ARP = 28
pkg syscall (netbsd-arm64), const AF_ARP ideal-int

pkg syscall (darwin-arm64), type WaitStatus uint32
pkg syscall (darwin-arm64), var Stderr int
pkg syscall (darwin-arm64), var Stdin int
pkg syscall (darwin-arm64), var Stdout int
pkg syscall (darwin-arm64-cgo), const AF_APPLETALK = 16
pkg syscall (darwin-arm64-cgo), const AF_APPLETALK ideal-int
pkg syscall (darwin-arm64-cgo), const AF_CCITT = 10

* s390x ingress controller support ([#52663](https://github.com/kubernetes/kubernetes/pull/52663), [@wwwtyro](https://github.com/wwwtyro))
* CRI: Add stdout/stderr fields to Exec and Attach requests. ([#52686](https://github.com/kubernetes/kubernetes/pull/52686), [@yujuhong](https://github.com/yujuhong))