1. Proposed title of this feature request

Option to scale router (ingress-controller) pods on the Multi-AZ ROSA (or OSD) cluster

2. What is the nature and description of the request?

ref: https://access.redhat.com/solutions/6903041

Even if the cluster has 3 infra nodes, currently there will not be 3 replicas of the routers in the OSD/ROSA cluster environment as the default configuration for the number of routers in the OSD/ROSA cluster environments is 2 only, and this default configuration cannot be changed. Customer wants to have an option to change this default configuration in ROSA.

In OCP on-prem, most of the customers followed 3 replicas of router pods for High Availability, as per the Red Hat Professional Services recommendation.

Also, it is possible to scale ingress-controller in OCP (ref below docs) but not in ROSA.

Manual Scaling: https://docs.openshift.com/container-platform/4.12/networking/ingress-operator.html#nw-ingress-controller-configuration_configuring-ingress  

Autoscaling: https://docs.openshift.com/container-platform/4.12/networking/ingress-operator.html#nw-autoscaling-ingress-controller_configuring-ingress 

3. Why does the customer need this? (List the business requirements here)

• For better High Availability and,

• From cost perspective (customer pays for 3 infra nodes but get only two router pods)

4. List any affected packages or components.

Networking/ingress-controller