scale up more worker nodes but they are not added to the Load Balancer instances (backend pool), if moving the router pod to the new worker nodes then co/ingress becomes degraded

4.12.0-0.nightly-2022-10-23-204408

100%

1. ensure the fresh install cluster works well.
2. scale up worker nodes.
$ oc -n openshift-machine-api get machineset
NAME                                  DESIRED   CURRENT   READY   AVAILABLE   AGE
hongli-1024-hnkrm-worker-us-east-2a   1         1         1       1           5h21m
hongli-1024-hnkrm-worker-us-east-2b   1         1         1       1           5h21m
hongli-1024-hnkrm-worker-us-east-2c   1         1         1       1           5h21m

$ oc -n openshift-machine-api scale machineset hongli-1024-hnkrm-worker-us-east-2a --replicas=2
machineset.machine.openshift.io/hongli-1024-hnkrm-worker-us-east-2a scaled

$ oc -n openshift-machine-api scale machineset hongli-1024-hnkrm-worker-us-east-2b --replicas=2
machineset.machine.openshift.io/hongli-1024-hnkrm-worker-us-east-2b scaled

(about 5 minutes later)
$ oc -n openshift-machine-api get machineset
NAME                                  DESIRED   CURRENT   READY   AVAILABLE   AGE
hongli-1024-hnkrm-worker-us-east-2a   2         2         2       2           5h29m
hongli-1024-hnkrm-worker-us-east-2b   2         2         2       2           5h29m
hongli-1024-hnkrm-worker-us-east-2c   1         1         1       1           5h29m


3. delete router pods and to make new ones running on new workers

$ oc get node
NAME                                         STATUS   ROLES                  AGE     VERSION
ip-10-0-128-45.us-east-2.compute.internal    Ready    worker                 71m     v1.25.2+4bd0702
ip-10-0-131-192.us-east-2.compute.internal   Ready    control-plane,master   6h35m   v1.25.2+4bd0702
ip-10-0-139-51.us-east-2.compute.internal    Ready    worker                 6h29m   v1.25.2+4bd0702
ip-10-0-162-228.us-east-2.compute.internal   Ready    worker                 71m     v1.25.2+4bd0702
ip-10-0-172-216.us-east-2.compute.internal   Ready    control-plane,master   6h35m   v1.25.2+4bd0702
ip-10-0-190-82.us-east-2.compute.internal    Ready    worker                 6h25m   v1.25.2+4bd0702
ip-10-0-196-26.us-east-2.compute.internal    Ready    control-plane,master   6h35m   v1.25.2+4bd0702
ip-10-0-199-158.us-east-2.compute.internal   Ready    worker                 6h28m   v1.25.2+4bd0702

$ oc -n openshift-ingress get pod -owide
NAME                              READY   STATUS    RESTARTS   AGE   IP           NODE                                         NOMINATED NODE   READINESS GATES
router-default-86444dcd84-cm96l   1/1     Running   0          65m   10.130.2.7   ip-10-0-128-45.us-east-2.compute.internal    <none>           <none>
router-default-86444dcd84-vpnjz   1/1     Running   0          65m   10.131.2.7   ip-10-0-162-228.us-east-2.compute.internal   <none>           <none>

$ oc get co ingress console authentication
NAME             VERSION                              AVAILABLE   PROGRESSING   DEGRADED   SINCE   MESSAGE
ingress          4.12.0-0.nightly-2022-10-23-204408   True        False         True       66m     The "default" ingress controller reports Degraded=True: DegradedConditions: One or more other status conditions indicate a degraded state: CanaryChecksSucceeding=False (CanaryChecksRepetitiveFailures: Canary route checks for the default ingress controller are failing)
console          4.12.0-0.nightly-2022-10-23-204408   False       False         False      66m     RouteHealthAvailable: failed to GET route (https://console-openshift-console.apps.hongli-1024.qe.devcluster.openshift.com): Get "https://console-openshift-console.apps.hongli-1024.qe.devcluster.openshift.com": EOF
authentication   4.12.0-0.nightly-2022-10-23-204408   False       False         True       66m     OAuthServerRouteEndpointAccessibleControllerAvailable: Get "https://oauth-openshift.apps.hongli-1024.qe.devcluster.openshift.com/healthz": EOF


checked the Load Balancer on AWS console and found that new created nodes are not added to load balancer. see the snapshot attached.

the LB should added new created instances automatically and ingress should work with new workers.

1. this is also reproducible with common user created LoadBalancer service.
2. if the LB service is created after adding the new nodes then it works well, we can see that all nodes are added to LB on AWS console.