Fix Policy/policy.open-cluster-management.io health check

Tried using the health check as listed here but it gave error:

| error setting app health: failed to get resource health for "Policy" with name "XXXX" in namespace "local-cluster": <string>:35: invalid value (nil) at index 1 in table for concat stack traceback: [G]: in function 'concat' <string>:35: in main chunk [G]: ?

This change fixes the error by updating how the noncompliant clusters are tracked and counted to use latest Lua recommendations.

Signed-off-by: Ian Tewksbury <itewk@redhat.com>

resource_customizations/policy.open-cluster-management.io/Policy/health.lua

@@ -14,10 +14,10 @@ if obj.status.status ~= nil then
   -- "root" policy
   for i, entry in ipairs(obj.status.status) do
     if entry.compliant ~= "Compliant" then
-      noncompliants[i] = entry.clustername
+      table.insert(noncompliants, entry.clustername)
     end
   end
-  if table.getn(noncompliants) == 0 then
+  if #noncompliants == 0 then
     hs.message = "All clusters are compliant"
   else
     hs.message = "NonCompliant clusters: " .. table.concat(noncompliants, ", ")
@@ -26,10 +26,10 @@ elseif obj.status.details ~= nil then
   -- "replicated" policy
   for i, entry in ipairs(obj.status.details) do
     if entry.compliant ~= "Compliant" then
-      noncompliants[i] = entry.templateMeta.name
+      table.insert(noncompliants, entry.templateMeta.name)
     end
   end
-  if table.getn(noncompliants) == 0 then
+  if #noncompliants == 0 then
     hs.message = "All templates are compliant"
   else
     hs.message = "NonCompliant templates: " .. table.concat(noncompliants, ", ")

resource_customizations/policy.open-cluster-management.io/Policy/testdata/degraded_replicated_compliant_before_noncompliant.yaml

@@ -0,0 +1,88 @@
+apiVersion: policy.open-cluster-management.io/v1
+kind: Policy
+metadata:
+  name: open-cluster-management-global-set.argo-example
+  namespace: local-cluster
+  labels:
+    policy.open-cluster-management.io/cluster-name: local-cluster
+    policy.open-cluster-management.io/cluster-namespace: local-cluster
+    policy.open-cluster-management.io/root-policy: open-cluster-management-global-set.argo-example
+spec:
+  disabled: false
+  policy-templates:
+    - objectDefinition:
+        apiVersion: policy.open-cluster-management.io/v1
+        kind: ConfigurationPolicy
+        metadata:
+          name: example-namespace
+        spec:
+          object-templates:
+            - complianceType: musthave
+              objectDefinition:
+                apiVersion: v1
+                kind: Namespace
+                metadata:
+                  name: example
+          remediationAction: inform
+          severity: low
+    - objectDefinition:
+        apiVersion: policy.open-cluster-management.io/v1
+        kind: ConfigurationPolicy
+        metadata:
+          name: example-pod
+        spec:
+          namespaceSelector:
+            exclude:
+              - kube-*
+            include:
+              - default
+          object-templates:
+            - complianceType: musthave
+              objectDefinition:
+                apiVersion: v1
+                kind: Pod
+                metadata:
+                  name: foobar
+                spec:
+                  containers:
+                    - image: 'registry.redhat.io/rhel9/httpd-24:latest'
+                      name: httpd
+                      securityContext:
+                        allowPrivilegeEscalation: false
+                        capabilities:
+                          drop:
+                            - ALL
+                        privileged: false
+                        runAsNonRoot: true
+          remediationAction: enforce
+          severity: low
+status:
+  compliant: NonCompliant
+  details:
+    - compliant: Compliant
+      history:
+        - eventName: open-cluster-management-global-set.argo-example.17e7034c879045a3
+          lastTimestamp: '2024-07-30T14:16:49Z'
+          message: 'Compliant; notification - pods [foobar] was created successfully in namespace default'
+      templateMeta:
+        creationTimestamp: null
+        name: example-foo
+    - compliant: NonCompliant
+      history:
+        - eventName: open-cluster-management-global-set.argo-example.17e701cc5101e3a4
+          lastTimestamp: '2024-07-30T13:49:19Z'
+          message: 'NonCompliant; violation - namespaces [example] not found'
+      templateMeta:
+        creationTimestamp: null
+        name: example-namespace
+    - compliant: Compliant
+      history:
+        - eventName: open-cluster-management-global-set.argo-example.17e7034c879045a3
+          lastTimestamp: '2024-07-30T14:16:49Z'
+          message: 'Compliant; notification - pods [foobar] was created successfully in namespace default'
+        - eventName: open-cluster-management-global-set.argo-example.17e7020b47782ddc
+          lastTimestamp: '2024-07-30T13:53:49Z'
+          message: 'NonCompliant; violation - pods [foobar] not found in namespace default'
+      templateMeta:
+        creationTimestamp: null
+        name: example-pod