Fix deregistering of deleted CAPI Machines

We have an issue that there is a gap between the CAPI Machine deletion and the AWSMachine deletion.
In this timeframe the kube-apiserver to the to be deleted control plane is no longer possible, but the deregistering of the LB member will be performed only for AWSMachine deletions.
This PR fixes the gap and also deregisteres the instance if the CAPI Machine is deleted.

Signed-off-by: Tobias Giese <tobias.giese@mercedes-benz.com>

Author: tobiasgiese

controllers/awsmachine_controller.go

@@ -867,8 +867,8 @@ func (r *AWSMachineReconciler) reconcileLBAttachment(machineScope *scope.Machine
 	elbsvc := r.getELBService(elbScope)
 
 	// In order to prevent sending request to a "not-ready" control plane machines, it is required to remove the machine
-	// from the ELB as soon as the machine gets deleted or when the machine is in a not running state.
-	if !machineScope.AWSMachine.DeletionTimestamp.IsZero() || !machineScope.InstanceIsRunning() {
+	// from the ELB as soon as the machine or infra machine gets deleted or when the machine is in a not running state.
+	if machineScope.AWSMachineIsDeleted() || machineScope.MachineIsDeleted() || !machineScope.InstanceIsRunning() {
 		if elbScope.ControlPlaneLoadBalancer().LoadBalancerType == infrav1.LoadBalancerTypeClassic {
 			machineScope.Debug("deregistering from classic load balancer")
 			return r.deregisterInstanceFromClassicLB(machineScope, elbsvc, i)

pkg/cloud/scope/machine.go

@@ -360,11 +360,16 @@ func (m *MachineScope) InstanceIsInKnownState() bool {
 	return state != nil && infrav1.InstanceKnownStates.Has(string(*state))
 }
 
-// AWSMachineIsDeleted checks if the machine was deleted.
+// AWSMachineIsDeleted checks if the AWS machine was deleted.
 func (m *MachineScope) AWSMachineIsDeleted() bool {
 	return !m.AWSMachine.ObjectMeta.DeletionTimestamp.IsZero()
 }
 
+// MachineIsDeleted checks if the machine was deleted.
+func (m *MachineScope) MachineIsDeleted() bool {
+	return !m.Machine.ObjectMeta.DeletionTimestamp.IsZero()
+}
+
 // IsEKSManaged checks if the machine is EKS managed.
 func (m *MachineScope) IsEKSManaged() bool {
 	return m.InfraCluster.InfraCluster().GetObjectKind().GroupVersionKind().Kind == ekscontrolplanev1.AWSManagedControlPlaneKind