verified clusterversion: 4.6.0-0.nightly-2020-07-07-233934 steps: 1. Edit machineset zhsunaws78-cvvl8-worker-us-east-2c with "replicas: " 2. Create clusterautoscaler 3. Create machineautoscale $ oc get machineautoscaler NAME REF KIND REF NAME MIN MAX AGE worker-c MachineSet zhsunaws78-cvvl8-worker-us-east-2c 1 3 20m 4. Check the autoscale logs, W0709 07:41:47.928811 1 clusterapi_machineset.go:77] MachineSet "zhsunaws78-cvvl8-worker-us-east-2c" has nil spec.replicas. This is unsupported behaviour. Falling back to status.replicas. 5. Create workload to scale up the cluster, autoscaler could scale up W0709 07:42:12.166424 1 clusterapi_machineset.go:77] MachineSet "zhsunaws78-cvvl8-worker-us-east-2c" has nil spec.replicas. This is unsupported behaviour. Falling back to status.replicas. I0709 07:42:12.166474 1 scale_up.go:570] Final scale-up plan: [{openshift-machine-api/zhsunaws78-cvvl8-worker-us-east-2c 1->3 (max: 3)}] I0709 07:42:12.166506 1 scale_up.go:659] Scale-up: setting group openshift-machine-api/zhsunaws78-cvvl8-worker-us-east-2c size to 3 W0709 07:42:12.365423 1 clusterapi_machineset.go:77] MachineSet "zhsunaws78-cvvl8-worker-us-east-2c" has nil spec.replicas. This is unsupported behaviour. Falling back to status.replicas.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (OpenShift Container Platform 4.6 GA Images), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:4196