Cloud Run on GKE brings a managed experience for Knative/serving and Istio that aligns with Cloud Run. We install and manage the Knative version in your cluster and keep it running for you. Above what you get with base Kubernetes ability to deploy a container, Cloud Run on GKE gives you request-based auto-scaling of container instances, network programming with Istio, and Stackdriver integration for logging, monitoring, and metrics. You also get the Cloud Run UI and CLI to deploy, manage, and update your services.
One of our core goals with Cloud Run is to enable serverless portability; not just for workloads, but tooling and developer experiences. By offering Cloud Run in both a hosted and Kubernetes platform, both enabled by Knative, you can leverage compatible serverless tooling and knowledge across the range of platforms from hosted to GKE to k8s anywhere.