Now that we migrated (and also upgraded ocp version) the CentOS CI OCP cluster in AWS, we get now some warnings about memory consumption on the control plane nodes.
They were provisioned with smaller instance types than the worker nodes, so we just need to ensure the etcd cluster will remain up with two nodes while we each time change instance type.
That would ensure that if something would happen in a region, two etcd nodes would have enough memory for the cluster to be fully working