Container Engine for Kubernetes now automatically adds the oci.oraclecloud.com/fault-domain label to each worker node (compute instance) in a cluster, according to the fault domain in which it is placed.

You can constrain the worker nodes on which to run a pod by including the oci.oraclecloud.com/faultdomain label in the pod specification.

You'll typically use the oci.oraclecloud.com/fault-domain label to achieve high availability when a cluster is located in a region with a single availability domain.

For more information, see Supported Labels for Different Usecases - oci.oraclecloud.com/fault-domain.