Added cpu-load-test appliation

To show metrics-transfer trigger from sno to acm hub cluster.

2024-01-09-openshift-acm-sno-o11y/README.org

@@ -338,3 +338,51 @@ oc get secret sno-import -n sno -o jsonpath={.data.import\\.yaml} | base64 --dec
 oc --kubeconfig sno/auth/kubeconfig apply --filename klusterlet-crd.yaml
 oc --kubeconfig sno/auth/kubeconfig apply --filename import.yaml
 #+end_src
+
+If everything works fine you should see JOINED and AVAILABLE sno cluster from within your hub cluster
+
+#+begin_src tmux
+❯ kubectl get managedcluster -n sno
+NAME            HUB ACCEPTED   MANAGED CLUSTER URLS                                           JOINED   AVAILABLE   AGE
+local-cluster   true           https://api.hub.<yourdomain>.com:6443                          True     True        5h12m
+sno             true           https://api.cluster-vzmvz.<yourdomain>.com:6443                True     True        31m
+#+end_src
+
+* 7 - Creating the edge workload on SNO
+For edge scenarios we only send metrics to the hub cluster if certain thresholds are hit for a certain period of time (here 70% for more than 2 minutes - you can see this configuration in the open-cluster-management-addon-observability namespace under ConfigMaps observability-metrics-allowlist in the collect_rules section under SNOHighCPUUsage).
+In order to hit that trigger we now deploy a cpu-heavy workload in order for sno-cluster metrics being sent to the ACM hub cluster.
+
+Let's get started by creating a new project on the sno cluster:
+#+begin_src tmux
+oc new-project cpu-load-test
+#+end_src
+
+and deploy the cpu-load-container workload on a busybox container
+
+#+begin_src tmux
+cat << EOF | oc apply --filename -
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: cpu-load-test
+spec:
+  replicas: 5
+  selector:
+    matchLabels:
+      app: cpu-load-test
+  template:
+    metadata:
+      labels:
+        app: cpu-load-test
+    spec:
+      containers:
+      - name: cpu-load-container
+        image: busybox
+        command: ["/bin/sh", "-c"]
+        args:
+          - while true; do
+              echo "Performing CPU load...";
+              dd if=/dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 1000 | head -n 1000000 > /dev/null;
+            done
+EOF
+#+end_src