Replace the current service with the new revision. Deploy the new revision with no traffic allocated. After the deployment, split the traffic between the previous service and the new revision.

Update the current service with the new changes. Deploy the new revision. After the deployment, split the traffic between the current service and the new revision.

Update the current service with the new changes. Deploy the new revision with no traffic allocated. Split the traffic between the current service and the new revision.

Replace the current service with the new revision. Deploy the new revision. Create a load balancer to split the traffic between the previous service and the new revision.