support metrics collection in scaling config for unmanaged node groups

examples/05-advanced-nodegroups.yaml

@@ -1,5 +1,5 @@
 # An advanced example of ClusterConfig object with customised nodegroups:
---- 
+---
 apiVersion: eksctl.io/v1alpha5
 kind: ClusterConfig
 
@@ -42,6 +42,17 @@ nodeGroups:
       nodegroup-type: very-special-science-workloads
     classicLoadBalancerNames:
       - ng3-classic-load-balancer
+    asgMetricsCollection:
+      - granularity: 1Minute
+        metrics:
+          - GroupMinSize
+          - GroupMaxSize
+          - GroupDesiredCapacity
+          - GroupInServiceInstances
+          - GroupPendingInstances
+          - GroupStandbyInstances
+          - GroupTerminatingInstances
+          - GroupTotalInstances
     taints:
       special: "true:NoSchedule"
     privateNetworking: true

pkg/apis/eksctl.io/v1alpha5/types.go

@@ -619,6 +619,8 @@ type NodeGroup struct {
 	MinSize *int `json:"minSize,omitempty"`
 	// +optional
 	MaxSize *int `json:"maxSize,omitempty"`
+	// +optional
+	ASGMetricsCollection []MetricsCollection `json:"asgMetricsCollection,omitempty"`
 
 	// +optional
 	EBSOptimized *bool `json:"ebsOptimized,omitempty"`
@@ -787,6 +789,15 @@ type (
 	}
 )
 
+// MetricsCollection used by the scaling config
+// https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-as-metricscollection.html
+type MetricsCollection struct {
+	// +required
+	Granularity string `json:"granularity"`
+	// +optional
+	Metrics []string `json:"metrics,omitempty"`
+}
+
 // ScalingConfig defines the scaling config
 type ScalingConfig struct {
 	// +optional

pkg/cfn/builder/api_test.go

@@ -73,6 +73,7 @@ type Properties struct {
 	VPCZoneIdentifier interface{}
 
 	LoadBalancerNames                 []string
+	MetricsCollection                 []map[string]interface{}
 	TargetGroupARNs                   []string
 	DesiredCapacity, MinSize, MaxSize string
 
@@ -811,7 +812,15 @@ var _ = Describe("CloudFormation template builder API", func() {
 
 	Context("NodeGroupAutoScaling", func() {
 		cfg, ng := newClusterConfigAndNodegroup(true)
-
+		ng.ASGMetricsCollection = []api.MetricsCollection{
+			{
+				Granularity: "1Minute",
+				Metrics: []string{
+					"GroupMinSize",
+					"GroupMaxSize",
+				},
+			},
+		}
 		ng.ClassicLoadBalancerNames = []string{"clb-1", "clb-2"}
 		ng.TargetGroupARNs = []string{"tg-arn-1", "tg-arn-2"}
 
@@ -916,6 +925,21 @@ var _ = Describe("CloudFormation template builder API", func() {
 			Expect(ng.Properties.LoadBalancerNames).To(Equal([]string{"clb-1", "clb-2"}))
 		})
 
+		It("should have metrics collections set", func() {
+			Expect(ngTemplate.Resources).To(HaveKey("NodeGroup"))
+			ng := ngTemplate.Resources["NodeGroup"]
+			Expect(ng).ToNot(BeNil())
+			Expect(ng.Properties).ToNot(BeNil())
+
+			Expect(ng.Properties.MetricsCollection).To(HaveLen(1))
+			var metricsCollection map[string]interface{} = ng.Properties.MetricsCollection[0]
+			Expect(metricsCollection).To(HaveKey("Granularity"))
+			Expect(metricsCollection).To(HaveKey("Metrics"))
+			Expect(metricsCollection["Granularity"]).To(Equal("1Minute"))
+			Expect(metricsCollection["Metrics"]).To(ContainElement("GroupMinSize"))
+			Expect(metricsCollection["Metrics"]).To(ContainElement("GroupMaxSize"))
+		})
+
 		It("should have target groups ARNs set", func() {
 			Expect(ngTemplate.Resources).To(HaveKey("NodeGroup"))
 			ng := ngTemplate.Resources["NodeGroup"]

pkg/cfn/builder/nodegroup.go

@@ -274,6 +274,9 @@ func nodeGroupResource(launchTemplateName *gfn.Value, vpcZoneIdentifier interfac
 	if ng.MaxSize != nil {
 		ngProps["MaxSize"] = fmt.Sprintf("%d", *ng.MaxSize)
 	}
+	if len(ng.ASGMetricsCollection) > 0 {
+		ngProps["MetricsCollection"] = metricsCollectionResource(ng.ASGMetricsCollection)
+	}
 	if len(ng.ClassicLoadBalancerNames) > 0 {
 		ngProps["LoadBalancerNames"] = ng.ClassicLoadBalancerNames
 	}
@@ -345,3 +348,18 @@ func mixedInstancesPolicy(launchTemplateName *gfn.Value, ng *api.NodeGroup) *map
 
 	return &policy
 }
+
+func metricsCollectionResource(asgMetricsCollection []api.MetricsCollection) []map[string]interface{} {
+	var metricsCollections []map[string]interface{}
+	for _, m := range asgMetricsCollection {
+		newCollection := make(map[string]interface{})
+
+		var metrics []string
+		metrics = append(metrics, m.Metrics...)
+		newCollection["Metrics"] = metrics
+		newCollection["Granularity"] = m.Granularity
+
+		metricsCollections = append(metricsCollections, newCollection)
+	}
+	return metricsCollections
+}

userdocs/src/usage/eks-managed-nodes.md

@@ -179,6 +179,7 @@ the provisioned Autoscaling Group like in unmanaged nodegroups.
 - Control over the node bootstrapping process and customization of the kubelet are not supported. This includes the
 following fields: `classicLoadBalancerNames`, `maxPodsPerNode`, `taints`, `targetGroupARNs`, `preBootstrapCommands`, `overrideBootstrapCommand`,
 `clusterDNS` and `kubeletExtraConfig`.
+- No support for enabling metrics on AutoScalingGroups using `asgMetricsCollection`
 
 ## Note for eksctl versions below 0.12.0
 - For clusters upgraded from EKS 1.13 to EKS 1.14, managed nodegroups will not be able to communicate with unmanaged

userdocs/src/usage/managing-nodegroups.md

@@ -77,6 +77,17 @@ nodeGroups:
     classicLoadBalancerNames:
       - dev-clb-1
       - dev-clb-2
+    asgMetricsCollection:
+      - granularity: 1Minute
+        metrics:
+          - GroupMinSize
+          - GroupMaxSize
+          - GroupDesiredCapacity
+          - GroupInServiceInstances
+          - GroupPendingInstances
+          - GroupStandbyInstances
+          - GroupTerminatingInstances
+          - GroupTotalInstances
   - name: ng-2-api
     labels: { role: api }
     instanceType: m5.2xlarge

userdocs/src/usage/schema.md

@@ -353,6 +353,18 @@ ManagedNodeGroup:
   - ScalingConfig
   - privateNetworking
   type: object
+MetricsCollection:
+  additionalProperties: false
+  properties:
+    granularity:
+      type: string
+    metrics:
+      items:
+        type: string
+      type: array
+  required:
+  - granularity
+  type: object
 Network:
   additionalProperties: false
   properties:
@@ -369,6 +381,11 @@ NodeGroup:
       type: string
     amiFamily:
       type: string
+    asgMetricsCollection:
+      items:
+        $ref: '#/definitions/MetricsCollection'
+        $schema: http://json-schema.org/draft-04/schema#
+      type: array
     availabilityZones:
       items:
         type: string