Add feature gate environment variable for machine pool machines

Author: AndiDog

config/manager/manager.yaml

@@ -19,7 +19,7 @@ spec:
       containers:
         - args:
             - "--leader-elect"
-            - "--feature-gates=EKS=${CAPA_EKS:=true},EKSEnableIAM=${CAPA_EKS_IAM:=false},EKSAllowAddRoles=${CAPA_EKS_ADD_ROLES:=false},EKSFargate=${EXP_EKS_FARGATE:=false},MachinePool=${EXP_MACHINE_POOL:=false},EventBridgeInstanceState=${EVENT_BRIDGE_INSTANCE_STATE:=false},AutoControllerIdentityCreator=${AUTO_CONTROLLER_IDENTITY_CREATOR:=true},BootstrapFormatIgnition=${EXP_BOOTSTRAP_FORMAT_IGNITION:=false},ExternalResourceGC=${EXTERNAL_RESOURCE_GC:=true},AlternativeGCStrategy=${ALTERNATIVE_GC_STRATEGY:=false},TagUnmanagedNetworkResources=${TAG_UNMANAGED_NETWORK_RESOURCES:=true},ROSA=${EXP_ROSA:=false}"
+            - "--feature-gates=EKS=${CAPA_EKS:=true},EKSEnableIAM=${CAPA_EKS_IAM:=false},EKSAllowAddRoles=${CAPA_EKS_ADD_ROLES:=false},EKSFargate=${EXP_EKS_FARGATE:=false},MachinePool=${EXP_MACHINE_POOL:=false},MachinePoolMachines=${EXP_MACHINE_POOL_MACHINES:=false},EventBridgeInstanceState=${EVENT_BRIDGE_INSTANCE_STATE:=false},AutoControllerIdentityCreator=${AUTO_CONTROLLER_IDENTITY_CREATOR:=true},BootstrapFormatIgnition=${EXP_BOOTSTRAP_FORMAT_IGNITION:=false},ExternalResourceGC=${EXTERNAL_RESOURCE_GC:=true},AlternativeGCStrategy=${ALTERNATIVE_GC_STRATEGY:=false},TagUnmanagedNetworkResources=${TAG_UNMANAGED_NETWORK_RESOURCES:=true},ROSA=${EXP_ROSA:=false}"
             - "--v=${CAPA_LOGLEVEL:=0}"
             - "--diagnostics-address=${CAPA_DIAGNOSTICS_ADDRESS:=:8443}"
             - "--insecure-diagnostics=${CAPA_INSECURE_DIAGNOSTICS:=false}"

docs/book/src/development/tilt-setup.md

@@ -52,6 +52,7 @@ Next, create a `tilt-settings.json` file and place it in your local copy of `clu
   "kustomize_substitutions": {
     "EXP_CLUSTER_RESOURCE_SET": "true",
     "EXP_MACHINE_POOL": "true",
+    "EXP_MACHINE_POOL_MACHINES": "true",
     "EVENT_BRIDGE_INSTANCE_STATE": "true",
     "AWS_B64ENCODED_CREDENTIALS": "W2RlZmFZSZnRg==",
     "EXP_EKS_FARGATE": "false",

docs/book/src/topics/machinepools.md

@@ -148,3 +148,7 @@ When using GitOps, make sure to ignore differences in `spec.replicas` on Machine
       jsonPointers:
         - /spec/replicas
 ```
+
+## Machine pool machines
+
+With the feature gate `MachinePoolMachines=true`, you can enable creation of `Machine`/`AWSMachine` objects for nodes created by a `AWSMachinePool`. This is experimental and will be used to introduce features such as per-node health checks.

docs/book/src/topics/reference/reference.md

@@ -9,10 +9,11 @@
 | EKSAllowAddRoles              | CAPA_EKS_ADD_ROLES                | false   |
 | EKSFargate                    | EXP_EKS_FARGATE                   | false   |
 | MachinePool                   | EXP_MACHINE_POOL                  | false   |
+| MachinePoolMachines           | EXP_MACHINE_POOL_MACHINES         | false   |
 | EventBridgeInstanceState      | EVENT_BRIDGE_INSTANCE_STATE       | false   |
 | AutoControllerIdentityCreator | AUTO_CONTROLLER_IDENTITY_CREATOR  | true    |
 | BootstrapFormatIgnition       | EXP_BOOTSTRAP_FORMAT_IGNITION     | false   |
 | ExternalResourceGC            | EXP_EXTERNAL_RESOURCE_GC          | false   |
 | AlternativeGCStrategy         | EXP_ALTERNATIVE_GC_STRATEGY       | false   |
 | TagUnmanagedNetworkResources  | TAG_UNMANAGED_NETWORK_RESOURCES   | true    |
-| ROSA                          | EXP_ROSA                          | false   |
+| ROSA                          | EXP_ROSA                          | false   |

test/e2e/data/e2e_conf.yaml

@@ -209,6 +209,7 @@ variables:
   # Enabling the feature flags by setting the env variables.
   EXP_CLUSTER_RESOURCE_SET: "true"
   EXP_MACHINE_POOL: "true"
+  EXP_MACHINE_POOL_MACHINES: "true"
   CLUSTER_TOPOLOGY: "true"
   INIT_WITH_BINARY_V1BETA1: "https://github.com/kubernetes-sigs/cluster-api/releases/download/v1.2.0/clusterctl-{OS}-{ARCH}"
   # INIT_WITH_KUBERNETES_VERSION are only used by the clusterctl upgrade test to initialize

test/e2e/data/e2e_eks_conf.yaml

@@ -123,6 +123,7 @@ variables:
   UPGRADE_TO_VERSION: "v1.32.0"
   UPGRADE_FROM_VERSION: "v1.31.0"
   EXP_MACHINE_POOL: "true"
+  EXP_MACHINE_POOL_MACHINES: "true"
   EXP_CLUSTER_RESOURCE_SET: "true"
   EVENT_BRIDGE_INSTANCE_STATE: "true"
   AWS_NODE_MACHINE_TYPE: t3.large