feat: Implement cluster-api MachinePool CRD health checks (#19595)

Signed-off-by: afarbos <farbos.arnaud@gmail.com>

---------

Signed-off-by: Arnaud Farbos <farbos.arnaud@gmail.com>
Signed-off-by: afarbos <farbos.arnaud@gmail.com>

resource_customizations/cluster.x-k8s.io/MachinePool/health.lua

@@ -0,0 +1,48 @@
+-- Reference CRD can be found here:
+-- https://doc.crds.dev/github.com/kubernetes-sigs/cluster-api/cluster.x-k8s.io/MachinePool/v1beta1@v1.8.1
+
+function getStatusBasedOnPhase(obj, hs)
+    -- Phases can be found here: 
+    -- https://github.com/kubernetes-sigs/cluster-api/blob/release-1.8/exp/api/v1beta1/machinepool_types.go#L139-L182
+    if obj.status ~= nil and obj.status.phase ~= nil then
+        hs.message = "MachinePool is " .. obj.status.phase
+        if obj.status.phase == "Running" then
+            hs.status = "Healthy"
+        end
+        if obj.status.phase == "Failed" or obj.status.phase == "Unknown"  then
+            hs.status = "Degraded"
+        end
+    end
+    return hs
+end
+
+function getConditionStatuses(obj, hs)
+    local extraInfo = ""
+    if obj.status ~= nil and obj.status.conditions ~= nil then
+        for i, condition in ipairs(obj.status.conditions) do
+            if condition.type ~= nil and condition.status == "False" then
+                if extraInfo ~= "" then
+                    extraInfo = extraInfo .. ", "
+                end
+                extraInfo = extraInfo .. "Not " .. condition.type
+                if condition.reason ~= nil then
+                    extraInfo = extraInfo .. " (" .. condition.reason .. ")"
+                end
+            end
+        end
+    end
+    if extraInfo ~= "" then
+        hs.message = hs.message .. ": " .. extraInfo
+    end
+
+    return hs
+end
+
+local hs = {}
+hs.status = "Progressing"
+hs.message = ""
+
+getStatusBasedOnPhase(obj, hs)
+getConditionStatuses(obj, hs)
+
+return hs

resource_customizations/cluster.x-k8s.io/MachinePool/health_test.yaml

@@ -0,0 +1,13 @@
+tests:
+- healthStatus:
+    status: Healthy
+    message: 'MachinePool is Running'
+  inputPath: testdata/healthy_provisioned.yaml
+- healthStatus:
+    status: Progressing
+    message: 'MachinePool is Provisioning: Not Ready (WaitingForInfrastructure), Not InfrastructureReady (WaitingForInfrastructure)'
+  inputPath: testdata/progressing_provisioning.yaml
+- healthStatus:
+    status: Degraded
+    message: 'MachinePool is Failed'
+  inputPath: testdata/degraded_failed.yaml

resource_customizations/cluster.x-k8s.io/MachinePool/testdata/degraded_failed.yaml

@@ -0,0 +1,25 @@
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: MachinePool
+metadata:
+  labels:
+    argocd.argoproj.io/instance: foo
+    cluster.x-k8s.io/cluster-name: foo
+  name: foo-pool
+  namespace: default
+spec:
+  clusterName: foo
+  replicas: 3
+  template:
+    metadata: {}
+    spec:
+      bootstrap:
+        dataSecretName: ""
+      clusterName: foo
+      infrastructureRef:
+        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
+        kind: AWSManagedMachinePool
+        name: foo-pool
+        namespace: default
+      version: v1.30.0
+status:
+  phase: Failed

resource_customizations/cluster.x-k8s.io/MachinePool/testdata/healthy_provisioned.yaml

@@ -0,0 +1,57 @@
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: MachinePool
+metadata:
+  labels:
+    argocd.argoproj.io/instance: foo
+    cluster.x-k8s.io/cluster-name: foo
+  name: foo-pool
+  namespace: default
+spec:
+  clusterName: foo
+  replicas: 3
+  template:
+    metadata: {}
+    spec:
+      bootstrap:
+        dataSecretName: ""
+      clusterName: foo
+      infrastructureRef:
+        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
+        kind: AWSManagedMachinePool
+        name: foo-pool
+        namespace: default
+      version: v1.30.0
+status:
+  availableReplicas: 3
+  bootstrapReady: true
+  conditions:
+    - lastTransitionTime: '2024-08-19T20:33:02Z'
+      status: 'True'
+      type: Ready
+    - lastTransitionTime: '2024-08-19T20:18:31Z'
+      status: 'True'
+      type: BootstrapReady
+    - lastTransitionTime: '2024-08-19T20:33:02Z'
+      status: 'True'
+      type: InfrastructureReady
+    - lastTransitionTime: '2024-08-19T20:18:31Z'
+      status: 'True'
+      type: ReplicasReady
+  infrastructureReady: true
+  nodeRefs:
+    - apiVersion: v1
+      kind: Node
+      name: ip-18-232-50-123-ec2.internal
+      uid: e4b3a44f-1c2d-4fd3-bb9e-3b0e08787a5a
+    - apiVersion: v1
+      kind: Node
+      name: ip-52-23-45-67-ec2.internal
+      uid: 2b9dabe5-3a1d-429a-985b-5e7ffb9649c6
+    - apiVersion: v1
+      kind: Node
+      name: ip-34-207-89-12-ec2.internal
+      uid: 6f94031a-d3e4-48f7-bc94-22bb9b687f5e
+  observedGeneration: 2
+  phase: Running
+  readyReplicas: 3
+  replicas: 3

resource_customizations/cluster.x-k8s.io/MachinePool/testdata/progressing_provisioning.yaml

@@ -0,0 +1,44 @@
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: MachinePool
+metadata:
+  labels:
+    argocd.argoproj.io/instance: foo
+    cluster.x-k8s.io/cluster-name: foo
+  name: foo-pool
+  namespace: default
+spec:
+  clusterName: foo
+  replicas: 3
+  template:
+    metadata: {}
+    spec:
+      bootstrap:
+        dataSecretName: ""
+      clusterName: foo
+      infrastructureRef:
+        apiVersion: infrastructure.cluster.x-k8s.io/v1beta2
+        kind: AWSManagedMachinePool
+        name: foo-pool
+        namespace: default
+      version: v1.30.0
+status:
+  bootstrapReady: true
+  conditions:
+    - lastTransitionTime: '2024-08-19T20:26:30Z'
+      reason: WaitingForInfrastructure
+      severity: Info
+      status: 'False'
+      type: Ready
+    - lastTransitionTime: '2024-08-19T20:26:30Z'
+      status: 'True'
+      type: BootstrapReady
+    - lastTransitionTime: '2024-08-19T20:26:30Z'
+      reason: WaitingForInfrastructure
+      severity: Info
+      status: 'False'
+      type: InfrastructureReady
+    - lastTransitionTime: '2024-08-19T20:26:30Z'
+      status: 'True'
+      type: ReplicasReady
+  observedGeneration: 1
+  phase: Provisioning