gcloud beta compute instance-groups managed rolling-action start-update my-instance-group --version template=myapp-version-b
gcloud beta compute instance-groups managed rolling-action start-update my-instance-group --version template=myapp-version-a
gcloud beta compute instance-groups managed rolling-action start-update my-instance-group --version template=myapp-version-b --max-unavailable 25%
gcloud beta compute instance-groups managed rolling-action start-update my-instance-group --version template=myapp-version-a --canary-version template=myapp-version-b,target-size=1
gcloud beta compute instance-groups managed rolling-action start-update my-instance-group --version template=myapp-version-a --canary-version template=myapp-version-b,target-size=50%
gcloud beta compute instance-groups managed rolling-action replace my-instance-group --max-unavailable=10%
