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Please note that the provisioned clusters are equipped with an autoscaler component that is able to scale up or down the worker nodes depending on the load.

Currently it is acknowledged a known issue bug in Rancher which consists on the lack of cleanup of older ssh-keys after the worker nodes deletion by the autoscaler, which remain in the underlying Openstack project. Therefore after a frequent scale up/down it is possible to hit the limits of the Openstack ssh-keys quota preventing the creation of additional nodes by the autoscaler.

In case you hit this problem please raise an issue in the EWC Support Portal.