Azure-CCM: Bundle cloudProviderRateLimitQPS[Write] to the maxNodes

Ref: #532

```improvement operator
An issue where cloud controller manager was self-rate-limited for azure shoot clusters with more than 10 nodes has been fixed.
```

controllers/provider-azure/charts/internal/cloud-provider-config/templates/cloud-provider-config.tpl

@@ -21,9 +21,9 @@ cloudProviderBackoffExponent: 1.5
 cloudProviderBackoffDuration: 5
 cloudProviderBackoffJitter: 1.0
 cloudProviderRateLimit: true
-cloudProviderRateLimitQPS: 10.0
+cloudProviderRateLimitQPS: {{ ( max .Values.maxNodes 10 ) }}
 cloudProviderRateLimitBucket: 100
-cloudProviderRateLimitQPSWrite: 10.0
+cloudProviderRateLimitQPSWrite: {{ ( max .Values.maxNodes 10 ) }}
 cloudProviderRateLimitBucketWrite: 100
 {{- if semverCompare ">= 1.14" .Values.kubernetesVersion }}
 cloudProviderBackoffMode: v2

controllers/provider-azure/charts/internal/cloud-provider-config/values.yaml

@@ -9,4 +9,5 @@ vnetName: name
 subnetName: sname
 routeTableName: rtname
 securityGroupName: sgname
-region: location
+region: location
+maxNodes: 0

controllers/provider-azure/pkg/controller/controlplane/valuesprovider.go

@@ -213,6 +213,11 @@ func getConfigChartValues(
 		return nil, errors.Wrapf(err, "could not determine subnet, availability set, route table or security group name from infrastructureStatus of controlplane '%s'", util.ObjectName(cp))
 	}
 
+	var maxNodes int32
+	for _, worker := range cluster.Shoot.Spec.Provider.Workers {
+		maxNodes = maxNodes + worker.Maximum
+	}
+
 	// Collect config chart values.
 	values := map[string]interface{}{
 		"kubernetesVersion": cluster.Shoot.Spec.Kubernetes.Version,
@@ -226,6 +231,7 @@ func getConfigChartValues(
 		"routeTableName":    routeTableName,
 		"securityGroupName": securityGroupName,
 		"region":            cp.Spec.Region,
+		"maxNodes":          maxNodes,
 	}
 
 	if infraStatus.Networks.VNet.ResourceGroup != nil {

controllers/provider-azure/pkg/controller/controlplane/valuesprovider_test.go

@@ -38,7 +38,8 @@ import (
 )
 
 const (
-	namespace = "test"
+	namespace       = "test"
+	maxNodes  int32 = 0
 )
 
 var _ = Describe("ValuesProvider", func() {
@@ -450,6 +451,7 @@ var _ = Describe("ValuesProvider", func() {
 			"routeTableName":      "route-table-name",
 			"securityGroupName":   "security-group-name-workers",
 			"kubernetesVersion":   "1.13.4",
+			"maxNodes":            maxNodes,
 		}
 
 		configZonedClusterChartValues = map[string]interface{}{
@@ -464,6 +466,7 @@ var _ = Describe("ValuesProvider", func() {
 			"routeTableName":    "route-table-name",
 			"securityGroupName": "security-group-name-workers",
 			"kubernetesVersion": "1.13.4",
+			"maxNodes":          maxNodes,
 		}
 
 		ccmChartValues = map[string]interface{}{