https://issues.redhat.com/browse/XCMSTRAT-161 effort should be guarded by a feature flag. This will include:

Day 1 - ROSA classic and OSD CCS wizards:

• Max nodes count input (with and without autoscaling): 180 when the flag is OFF, 249 when the flag is ON. (Assuming enough quota)

• Cluster autoscaling settings modal: max-nodes total field - 180 + worker nodes + infra nodes when the flag is OFF, 249  + worker nodes + infra nodes when the flag is ON. 

Day 2 - ROSA classic and OSD Machine pools tab:

• Add/ Edit machine pool: Max nodes count input (with and without autoscaling): 180 when the flag is OFF, 249 when the flag is ON. (Assuming enough quota)

• Cluster autoscaling settings modal: max-nodes total field - 180 + worker nodes + infra nodes when the flag is OFF, 249  + worker nodes + infra nodes when the flag is ON.

Note:
When the flag is ON, the max value should be 249 only for clusters with OCP version > 4.14.14. For lower versions the max value should be 180.

Feature flag name in unleash: 'ocmui-max-nodes-total-249'