Cinder CSI driver controller targets showing down for prometheus:
~~~
openstack-cinder-csi-driver-controller-854d987bc9-n4ztn         https://10.129.0.48:9202/metrics                 down     server returned HTTP status 502 Bad Gateway   
openstack-cinder-csi-driver-controller-854d987bc9-qkzlx         https://10.130.0.38:9202/metrics                 down     server returned HTTP status 502 Bad Gateway
~~~
 
Servicemonitor is scraping metrics on driver-m port:
~~~
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
  name: openstack-cinder-csi-driver-controller-monitor
  namespace: openshift-cluster-csi-drivers
spec:
  endpoints:
    interval: 30s
    path: /metrics
    port: driver-m
    scheme: https
~~~

When the endpoints yaml are checked, driver-m port is mapped to 9202 port.
~~~
apiVersion: v1
kind: Endpoints
  name: openstack-cinder-csi-driver-controller-metrics
  namespace: openshift-cluster-csi-drivers
subsets:
- addresses:
  - ip: 10.129.0.48
    nodeName: master-xvpnp-0
    targetRef:
      kind: Pod
      name: openstack-cinder-csi-driver-controller-854d987bc9-n4ztn
      namespace: openshift-cluster-csi-drivers

  - ip: 10.130.0.38
    nodeName: master-fd4q2-1
    targetRef:
      kind: Pod
      name: openstack-cinder-csi-driver-controller-854d987bc9-qkzlx
      namespace: openshift-cluster-csi-drivers

  ports:
  - name: driver-m
    port: 9202
    protocol: TCP
~~~

From pod yaml, 9202 port is mapped to container: kube-rbac-proxy-8202
~~~
apiVersion: v1
kind: Pod  name: openstack-cinder-csi-driver-controller-854d987bc9-n4ztn
  namespace: openshift-cluster-csi-drivers
spec:
  containers:
  - args:
    - --secure-listen-address=0.0.0.0:9202
    - --upstream=http://127.0.0.1:8202/    name: kube-rbac-proxy-8202
    ports:
    - containerPort: 9202
      name: driver-m
      protocol: TCP
~~~

This container is showing below logs:
~~~
2025-04-10T08:27:22.374262574Z I0410 08:27:22.374224       1 kube-rbac-proxy.go:395] Starting TCP socket on 0.0.0.0:9202
2025-04-10T08:27:22.374502030Z I0410 08:27:22.374471       1 kube-rbac-proxy.go:402] Listening securely on 0.0.0.0:9202
2025-04-10T08:27:29.071617312Z I0410 08:27:29.071576       1 log.go:245] http: proxy error: dial tcp 127.0.0.1:8202: connect: connection refused
2025-04-10T08:27:46.671558739Z I0410 08:27:46.668164       1 log.go:245] http: proxy error: dial tcp 127.0.0.1:8202: connect: connection refused2025-04-11T09:26:59.064050080Z I0411 09:26:59.064000       1 log.go:245] http: proxy error: dial tcp 127.0.0.1:8202: connect: connection refused
2025-04-11T09:27:16.661091884Z I0411 09:27:16.659746       1 log.go:245] http: proxy error: dial tcp 127.0.0.1:8202: connect: connection refused
~~~

Other targets for same pod are showing up:
~~~
openstack-cinder-csi-driver-controller-854d987bc9-qkzlx         https://10.130.0.38:9203/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-n4ztn         https://10.129.0.48:9203/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-n4ztn         https://10.129.0.48:9204/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-qkzlx         https://10.130.0.38:9204/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-qkzlx         https://10.130.0.38:9205/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-n4ztn         https://10.129.0.48:9205/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-n4ztn         https://10.129.0.48:9206/metrics                 up                                                     
openstack-cinder-csi-driver-controller-854d987bc9-qkzlx         https://10.130.0.38:9206/metrics                 up
~~~

    OCP 4.18, 4.17 ,4.16 running Cinder CSI driver on OpenStack ENV

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openstack-cinder-csi-driver-controller target is showing as down for prometheus. 

openstack-cinder-csi-driver-controller target should be up for prometheus.