From d6519150ca4929cc28df87135274e1d64088163d Mon Sep 17 00:00:00 2001
From: Patrick Ohly <patrick.ohly@intel.com>
Date: Tue, 14 Sep 2021 10:33:05 +0200
Subject: [PATCH] component-base: verbosity in example command

The global klog flags were not enabled (an oversight?). Once they
get added, logging at different verbosity levels can be demonstrated.
---
 .../component-base/logs/example/README.md       | 17 +++++++++++++++++
 .../component-base/logs/example/cmd/logger.go   |  1 +
 2 files changed, 18 insertions(+)

diff --git a/staging/src/k8s.io/component-base/logs/example/README.md b/staging/src/k8s.io/component-base/logs/example/README.md
index c1b7b3785be..b70a5cf931b 100644
--- a/staging/src/k8s.io/component-base/logs/example/README.md
+++ b/staging/src/k8s.io/component-base/logs/example/README.md
@@ -50,3 +50,20 @@ E0605 22:04:02.019698 3229645 logger.go:61] Log using Errorf, err: fail
 E0605 22:04:02.019709 3229645 logger.go:62] "Log using ErrorS" err="fail"
 I0605 22:04:02.019714 3229645 logger.go:64] Log message has been redacted. Log argument #0 contains: [secret-key]
 ```
+
+## Verbosity
+
+```console
+go run ./staging/src/k8s.io/component-base/logs/example/cmd/logger.go -v1
+```
+
+```
+I0914 10:31:12.342958   54086 logger.go:61] Log using Infof, key: value
+I0914 10:31:12.343021   54086 logger.go:62] "Log using InfoS" key="value"
+E0914 10:31:12.343053   54086 logger.go:64] Log using Errorf, err: fail
+E0914 10:31:12.343064   54086 logger.go:65] "Log using ErrorS" err="fail"
+I0914 10:31:12.343073   54086 logger.go:67] Log with sensitive key, data: {"secret"}
+I0914 10:31:12.343090   54086 logger.go:68] Log less important message
+```
+
+The last line is not printed at the default log level.
diff --git a/staging/src/k8s.io/component-base/logs/example/cmd/logger.go b/staging/src/k8s.io/component-base/logs/example/cmd/logger.go
index c3ee30f1082..f3d8e7c9dbb 100644
--- a/staging/src/k8s.io/component-base/logs/example/cmd/logger.go
+++ b/staging/src/k8s.io/component-base/logs/example/cmd/logger.go
@@ -61,6 +61,7 @@ func runLogger() {
 	klog.ErrorS(err, "Log using ErrorS")
 	data := SensitiveData{Key: "secret"}
 	klog.Infof("Log with sensitive key, data: %q", data)
+	klog.V(1).Info("Log less important message")
 }
 
 type SensitiveData struct {