An existing GKE cluster uses n1-standard-2 nodes. You need to run additional pods that require n2-highmem-16 nodes without downtime. What should you do?

To add nodes with a different machine type to an existing GKE cluster without downtime, create a new node pool. This allows you to specify the n2-highmem-16 machine type for the new nodes. Your existing n1-standard-2 nodes will continue to run without interruption, and you can then deploy your new pods to the new node pool. Using gcloud container clusters upgrade would upgrade the entire cluster, which isn't the goal here and could cause downtime. Creating a new cluster is unnecessary and involves more operational overhead, including migrating existing services and managing two clusters temporarily, which is more disruptive than simply adding a node pool.