pkg log, const Lmicroseconds ideal-int
pkg log, const Lshortfile ideal-int
pkg log, const LstdFlags ideal-int
pkg log, const Ltime ideal-int
pkg log, func Fatal(...interface{})
pkg log, func Fatalf(string, ...interface{})
pkg log, func Fatalln(...interface{})
pkg log, func Flags() int
pkg log, func New(io.Writer, string, int) *Logger
pkg log, func Panic(...interface{})
pkg log, func Panicf(string, ...interface{})

- kubeadm: fix a potential panic if kubeadm discovers an invalid, existing kubeconfig file ([#79165](https://github.com/kubernetes/kubernetes/pull/79165), [@neolit123](https://github.com/neolit123))
- kubeadm: treat non-fatal errors as warnings when doing reset ([#80862](https://github.com/kubernetes/kubernetes/pull/80862), [@drpaneas](https://github.com/drpaneas))

- Fix a regression where kubeadm bails out with a fatal error when an optional version command line argument is supplied to the "kubeadm upgrade plan" command ([#94421](https://github.com/kubernetes/kubernetes/pull/94421), [@rosti](https://github.com/rosti)) [SIG Cluster Lifecycle]

pkg testing, type TB interface, Fail()
pkg testing, type TB interface, FailNow()
pkg testing, type TB interface, Failed() bool
pkg testing, type TB interface, Fatal(...interface{})
pkg testing, type TB interface, Fatalf(string, ...interface{})
pkg testing, type TB interface, Log(...interface{})
pkg testing, type TB interface, Logf(string, ...interface{})
pkg testing, type TB interface, Skip(...interface{})