As an OpenShift cluster admin, I would like Prometheus to gather metrics about Custom Metrics Autoscaler if it is installed. Please enhance the CMA operator so that it creates and manages PodMonitor objects so that Prometheus will gather metrics for all three CMA controllers (custom-metrics-autoscaler-operator, keda-operator, keda-metrics-apiserver).

1. These PodMonitor objects should be added to https://github.com/openshift/custom-metrics-autoscaler-operator/blob/main/resources/keda.yaml

---
apiVersion: monitoring.coreos.com/v1
kind: PodMonitor
metadata:
  name: custom-metrics-autoscaler-operator
  namespace: openshift-keda
  labels:
    name: custom-metrics-autoscaler-operator
spec:
  selector:
    matchLabels:
      name: custom-metrics-autoscaler-operator
  podMetricsEndpoints:
  - targetPort: 8080
    path: /metrics
    interval: 60s
---
apiVersion: monitoring.coreos.com/v1
kind: PodMonitor
metadata:
  name: keda-metrics-apiserver
  namespace: openshift-keda
  labels:
    app: keda-metrics-apiserver
spec:
  selector:
    matchLabels:
      app: keda-metrics-apiserver
  podMetricsEndpoints:
  - targetPort: 8080
    path: /metrics
    interval: 60s
---
apiVersion: monitoring.coreos.com/v1
kind: PodMonitor
metadata:
  name: keda-operator
  namespace: openshift-keda
  labels:
    name: keda-operator
spec:
  selector:
    matchLabels:
      name: keda-operator
  podMetricsEndpoints:
  - targetPort: 8080
    path: /metrics
    interval: 60s

2. The operator controller should be modified so that it ensures the above objects exist:

https://github.com/openshift/custom-metrics-autoscaler-operator/blob/main/controllers/keda/kedacontroller_controller.go#L87

3. The operator should be given permission to create/edit PodMonitor objects in its own namespace and the CMA operator should have a containerPort so that Prometheus will monitor it:

diff --git a/hack/cma-generate-csv.sh b/hack/cma-generate-csv.sh
index d1cf99a..9a03ade 100755
--- a/hack/cma-generate-csv.sh
+++ b/hack/cma-generate-csv.sh
@@ -40,6 +40,17 @@ spec:
   icon:
   - base64data: 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
     mediatype: image/svg+xml
+  install:
+    spec:
+      permissions:
+      - rules:
+        - apiGroups:
+          - monitoring.coreos.com
+          resources:
+          - podmonitors
+          verbs:
+          - '*'
+        serviceAccountName: custom-metrics-autoscaler-operator
   links:
   - name: Custom Metrics Autoscaler Documentation
     url: https://docs.openshift.com/container-platform/latest/nodes/pods/nodes-pods-autoscaling-custom.html
@@ -65,6 +76,8 @@ jq_filter="$jq_filter"'.metadata.annotations."alm-examples" |= sub("\"namespace
 jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].command |= [ "/usr/bin/bash" ] |'
 # export the env vars and then exec /manager
 jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].args |= ["-c", "export KEDA_OPERATOR_IMAGE=$RELATED_IMAGE_1; export KEDA_METRICS_SERVER_IMAGE=$RELATED_IMAGE_2; exec /manager \"$0\" \"$@\"" ] + .  |'
+# add a port to the CMA operator so its metrics can be monitored
jYsNDIuNTMsNDRhNi40Myw2LjQzLDAsMCwxLC4yMi0xLjk0bC0zLjY2LDkuMDZhMTguNDUsMTguNDUsMCwwLDAtMS41MSw3LjMzYzAsMTguMTEsNDEsNDUuNDgsODcuNzQsNDUuNDgsMjAuNjksMCwzNi40My03Ljc2LDM2LjQzLTIxLjc3LDAtMS4wOCwwLTEuOTQtMS43My0xMC4xM1oiLz48cGF0aCBjbGFzcz0iY2xzLTEiIGQ9Ik0xMjcuNDcsODMuNDljMTIuNTEsMCwzMC42MS0yLjU4LDMwLjYxLTE3LjQ2YTE0LDE0LDAsMCwwLS4zMS0zLjQybC03LjQ1LTMyLjM2Yy0xLjcyLTcuMTItMy4yMy0xMC4zNS0xNS43My0xNi42QzEyNC44OSw4LjY5LDEwMy43Ni41LDk3LjUxLjUsOTEuNjkuNSw5MCw4LDgzLjA2LDhjLTYuNjgsMC0xMS42NC01LjYtMTcuODktNS42LTYsMC05LjkxLDQuMDktMTIuOTMsMTIuNSwwLDAtOC40MSwyMy43Mi05LjQ5LDI3LjE2QTYuNDMsNi40MywwLDAsMCw0Mi41Myw0NGMwLDkuMjIsMzYuMywzOS40NSw4NC45NCwzOS40NU0xNjAsNzIuMDdjMS43Myw4LjE5LDEuNzMsOS4wNSwxLjczLDEwLjEzLDAsMTQtMTUuNzQsMjEuNzctMzYuNDMsMjEuNzdDNzguNTQsMTA0LDM3LjU4LDc2LjYsMzcuNTgsNTguNDlhMTguNDUsMTguNDUsMCwwLDEsMS41MS03LjMzQzIyLjI3LDUyLC41LDU1LC41LDc0LjIyYzAsMzEuNDgsNzQuNTksNzAuMjgsMTMzLjY1LDcwLjI4LDQ1LjI4LDAsNTYuNy0yMC40OCw1Ni43LTM2LjY1LDAtMTIuNzItMTEtMjcuMTYtMzAuODMtMzUuNzgiLz48L3N2Zz4=
     mediatype: image/svg+xml
+  install:
+    spec:
+      permissions:
+      - rules:
+        - apiGroups:
+          - monitoring.coreos.com
+          resources:
+          - podmonitors
+          verbs:
+          - '*'
+        serviceAccountName: custom-metrics-autoscaler-operator
   links:
   - name: Custom Metrics Autoscaler Documentation
     url: https://docs.openshift.com/container-platform/latest/nodes/pods/nodes-pods-autoscaling-custom.html
@@ -65,6 +76,8 @@ jq_filter="$jq_filter"'.metadata.annotations."alm-examples" |= sub("\"namespace
 jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].command |= [ "/usr/bin/bash" ] |'
 # export the env vars and then exec /manager
 jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].args |= ["-c", "export KEDA_OPERATOR_IMAGE=$RELATED_IMAGE_1; export KEDA_METRICS_SERVER_IMAGE=$RELATED_IMAGE_2; exec /manager \"$0\" \"$@\"" ] + .  |'
+# add a port to the CMA operator so its metrics can be monitored
+jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].ports |= [\{"containerPort":8080,"name":"http","protocol":"TCP"}] |'
 # create a spot to pass in the operand image specs as env vars
 jq_filter="$jq_filter"'.spec.install.spec.deployments[0].spec.template.spec.containers[0].env += [\{"name":"RELATED_IMAGE_1","value":"CMA_OPERAND_PLACEHOLDER_1"},\{"name":"RELATED_IMAGE_2","value":"CMA_OPERAND_PLACEHOLDER_2"}]'