fix: opt into fixed klog stderrthreshold behavior

After klog.InitFlags(), set legacy_stderr_threshold_behavior=false
and stderrthreshold=INFO so that klog honors the stderrthreshold
flag correctly (kubernetes/klog#212).

The repo already uses klog/v2 v2.140.0, so no dependency bump
is needed.

Signed-off-by: Pierluigi Lenoci <pierluigi.lenoci@gmail.com>

Author: pierluigilenoci

cmd/root.go

@@ -117,6 +117,11 @@ func init() {
 	rootCmd.AddCommand(detectCmd)
 
 	klog.InitFlags(nil)
+
+	// Opt into fixed stderrthreshold behavior (kubernetes/klog#212).
+	_ = flag.Set("legacy_stderr_threshold_behavior", "false")
+	_ = flag.Set("stderrthreshold", "INFO")
+
 	pflag.CommandLine.AddGoFlag(flag.CommandLine.Lookup("v"))
 }