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fix: honor klog -stderrthreshold even when -logtostderr is true #4846

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pierluigilenoci wants to merge 1 commit into from
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fix: honor klog -stderrthreshold even when -logtostderr is true #4846

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5 changes: 5 additions & 0 deletions src/cmd/k9s.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,11 @@ func newK9sCommand() *cobra.Command {

// Mimic k9s/main.go:init()
klog.InitFlags(nil)
// Opt into the new klog behavior so that -stderrthreshold is honored even
// when -logtostderr=true (the default).
// Ref: kubernetes/klog#212, kubernetes/klog#432
flag.Set("legacy_stderr_threshold_behavior", "false") //nolint:errcheck
flag.Set("stderrthreshold", "INFO") //nolint:errcheck

@brandtkeller brandtkeller Apr 23, 2026

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Isn't this duplicative of line 40/45

if err := flag.Set("stderrthreshold", "fatal"); err != nil {
	return err
}

@pierluigilenoci pierluigilenoci Apr 24, 2026

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You're right on both counts, and I appreciate you taking the time to walk through this carefully.

  1. legacy_stderr_threshold_behavior: this flag only changes klog's behavior when logtostderr=true. Since this project explicitly sets logtostderr=false (line 42), the stderrthreshold is already honored by klog regardless — making the opt-in a no-op here.

  2. stderrthreshold=INFO: yes, this is immediately overwritten by stderrthreshold=fatal on line 45. Dead code.

I misread the existing code and assumed logtostderr was left at the klog default (true). The project's explicit logtostderr=false makes both additions unnecessary.

I'll close this PR. Sorry for the noise, and thanks for the thorough review.

if err := flag.Set("logtostderr", "false"); err != nil {
return err
}
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