update kube and vendor dependencies

With kubernetes 1.18 release of client-go, signatures on methods in
generated clientsets, dynamic, metadata, and scale clients have been
modified to accept context.Context as a first argument.
Signatures of Create, Update, and Patch methods have been updated
to accept CreateOptions, UpdateOptions and PatchOptions respectively.
Signatures of Delete and DeleteCollection methods now accept
DeleteOptions by value instead of by reference.
These changes are now accommodated with this PR and client-go
and dependencies are updated to v1.18.0

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

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

@@ -37,14 +37,21 @@ type StableCollector interface {
 
 	// Create will initialize all Desc and it intends to be called by registry.
 	Create(version *semver.Version, self StableCollector) bool
+
+	// ClearState will clear all the states marked by Create.
+	ClearState()
+
+	// HiddenMetrics tells the list of hidden metrics with fqName.
+	HiddenMetrics() []string
 }
 
 // BaseStableCollector which implements almost all of the methods defined by StableCollector
 // is a convenient assistant for custom collectors.
 // It is recommend that inherit BaseStableCollector when implementing custom collectors.
 type BaseStableCollector struct {
-	descriptors []*Desc // stores all Desc collected from DescribeWithStability().
-	registrable []*Desc // stores registrable Desc(not be hidden), is a subset of descriptors.
+	descriptors map[string]*Desc // stores all descriptors by pair<fqName, Desc>, these are collected from DescribeWithStability().
+	registrable map[string]*Desc // stores registrable descriptors by pair<fqName, Desc>, is a subset of descriptors.
+	hidden      map[string]*Desc // stores hidden descriptors by pair<fqName, Desc>, is a subset of descriptors.
 	self        StableCollector
 }
 
@@ -88,7 +95,19 @@ func (bsc *BaseStableCollector) Collect(ch chan<- prometheus.Metric) {
 }
 
 func (bsc *BaseStableCollector) add(d *Desc) {
-	bsc.descriptors = append(bsc.descriptors, d)
+	if len(d.fqName) == 0 {
+		panic("nameless metrics will be not allowed")
+	}
+
+	if bsc.descriptors == nil {
+		bsc.descriptors = make(map[string]*Desc)
+	}
+
+	if _, exist := bsc.descriptors[d.fqName]; exist {
+		panic(fmt.Sprintf("duplicate metrics (%s) will be not allowed", d.fqName))
+	}
+
+	bsc.descriptors[d.fqName] = d
 }
 
 // Init intends to be called by registry.
@@ -108,6 +127,22 @@ func (bsc *BaseStableCollector) init(self StableCollector) {
 	}
 }
 
+func (bsc *BaseStableCollector) trackRegistrableDescriptor(d *Desc) {
+	if bsc.registrable == nil {
+		bsc.registrable = make(map[string]*Desc)
+	}
+
+	bsc.registrable[d.fqName] = d
+}
+
+func (bsc *BaseStableCollector) trackHiddenDescriptor(d *Desc) {
+	if bsc.hidden == nil {
+		bsc.hidden = make(map[string]*Desc)
+	}
+
+	bsc.hidden[d.fqName] = d
+}
+
 // Create intends to be called by registry.
 // Create will return true as long as there is one or more metrics not be hidden.
 // Otherwise return false, that means the whole collector will be ignored by registry.
@@ -115,26 +150,12 @@ func (bsc *BaseStableCollector) Create(version *semver.Version, self StableColle
 	bsc.init(self)
 
 	for _, d := range bsc.descriptors {
-		if version != nil {
-			d.determineDeprecationStatus(*version)
+		d.create(version)
+		if d.IsHidden() {
+			bsc.trackHiddenDescriptor(d)
+		} else {
+			bsc.trackRegistrableDescriptor(d)
 		}
-
-		d.createOnce.Do(func() {
-			d.createLock.Lock()
-			defer d.createLock.Unlock()
-
-			if d.IsHidden() {
-				// do nothing for hidden metrics
-			} else if d.IsDeprecated() {
-				d.initializeDeprecatedDesc()
-				bsc.registrable = append(bsc.registrable, d)
-				d.isCreated = true
-			} else {
-				d.initialize()
-				bsc.registrable = append(bsc.registrable, d)
-				d.isCreated = true
-			}
-		})
 	}
 
 	if len(bsc.registrable) > 0 {
@@ -144,5 +165,26 @@ func (bsc *BaseStableCollector) Create(version *semver.Version, self StableColle
 	return false
 }
 
+// ClearState will clear all the states marked by Create.
+// It intends to be used for re-register a hidden metric.
+func (bsc *BaseStableCollector) ClearState() {
+	for _, d := range bsc.descriptors {
+		d.ClearState()
+	}
+
+	bsc.descriptors = nil
+	bsc.registrable = nil
+	bsc.hidden = nil
+	bsc.self = nil
+}
+
+// HiddenMetrics tells the list of hidden metrics with fqName.
+func (bsc *BaseStableCollector) HiddenMetrics() (fqNames []string) {
+	for i := range bsc.hidden {
+		fqNames = append(fqNames, bsc.hidden[i].fqName)
+	}
+	return
+}
+
 // Check if our BaseStableCollector implements necessary interface
 var _ StableCollector = &BaseStableCollector{}