rebase: update kubernetes to v1.21.2

Updated kubernetes packages to latest release.
resizefs package has been included into k8s.io/mount-utils
package. updated code to use the same.

Updates: #1968

Signed-off-by: Rakshith R <rar@redhat.com>

vendor/k8s.io/component-base/metrics/options.go

@@ -18,6 +18,7 @@ package metrics
 
 import (
 	"fmt"
+	"regexp"
 
 	"github.com/blang/semver"
 	"github.com/spf13/pflag"
@@ -28,6 +29,8 @@ import (
 // Options has all parameters needed for exposing metrics from components
 type Options struct {
 	ShowHiddenMetricsForVersion string
+	DisabledMetrics             []string
+	AllowListMapping            map[string]string
 }
 
 // NewOptions returns default metrics options
@@ -37,12 +40,20 @@ func NewOptions() *Options {
 
 // Validate validates metrics flags options.
 func (o *Options) Validate() []error {
+	var errs []error
 	err := validateShowHiddenMetricsVersion(parseVersion(version.Get()), o.ShowHiddenMetricsForVersion)
 	if err != nil {
-		return []error{err}
+		errs = append(errs, err)
 	}
 
-	return nil
+	if err := validateAllowMetricLabel(o.AllowListMapping); err != nil {
+		errs = append(errs, err)
+	}
+
+	if len(errs) == 0 {
+		return nil
+	}
+	return errs
 }
 
 // AddFlags adds flags for exposing component metrics.
@@ -56,13 +67,33 @@ func (o *Options) AddFlags(fs *pflag.FlagSet) {
 			"The format is <major>.<minor>, e.g.: '1.16'. "+
 			"The purpose of this format is make sure you have the opportunity to notice if the next release hides additional metrics, "+
 			"rather than being surprised when they are permanently removed in the release after that.")
+	fs.StringSliceVar(&o.DisabledMetrics,
+		"disabled-metrics",
+		o.DisabledMetrics,
+		"This flag provides an escape hatch for misbehaving metrics. "+
+			"You must provide the fully qualified metric name in order to disable it. "+
+			"Disclaimer: disabling metrics is higher in precedence than showing hidden metrics.")
+	fs.StringToStringVar(&o.AllowListMapping, "allow-metric-labels", o.AllowListMapping,
+		"The map from metric-label to value allow-list of this label. The key's format is <MetricName>,<LabelName>. "+
+			"The value's format is <allowed_value>,<allowed_value>..."+
+			"e.g. metric1,label1='v1,v2,v3', metric1,label2='v1,v2,v3' metric2,label1='v1,v2,v3'.")
 }
 
 // Apply applies parameters into global configuration of metrics.
 func (o *Options) Apply() {
-	if o != nil && len(o.ShowHiddenMetricsForVersion) > 0 {
+	if o == nil {
+		return
+	}
+	if len(o.ShowHiddenMetricsForVersion) > 0 {
 		SetShowHidden()
 	}
+	// set disabled metrics
+	for _, metricName := range o.DisabledMetrics {
+		SetDisabledMetric(metricName)
+	}
+	if o.AllowListMapping != nil {
+		SetLabelAllowListFromCLI(o.AllowListMapping)
+	}
 }
 
 func validateShowHiddenMetricsVersion(currentVersion semver.Version, targetVersionStr string) error {
@@ -77,3 +108,18 @@ func validateShowHiddenMetricsVersion(currentVersion semver.Version, targetVersi
 
 	return nil
 }
+
+func validateAllowMetricLabel(allowListMapping map[string]string) error {
+	if allowListMapping == nil {
+		return nil
+	}
+	metricNameRegex := `[a-zA-Z_:][a-zA-Z0-9_:]*`
+	labelRegex := `[a-zA-Z_][a-zA-Z0-9_]*`
+	for k := range allowListMapping {
+		reg := regexp.MustCompile(metricNameRegex + `,` + labelRegex)
+		if reg.FindString(k) != k {
+			return fmt.Errorf("--allow-metric-labels must has a list of kv pair with format `metricName:labelName=labelValue, labelValue,...`")
+		}
+	}
+	return nil
+}