deploymentMode
The deployment's type. Valid values are:
STANDARD: The deployment installed the specified revision.RESTART: The deployment restarted the application on the target instances using the revision from the deployment group's last successful deployment, without downloading a new revision.
This field is absent for deployments created before deploymentMode existed, and for STANDARD deployments. An absent value must not be interpreted as STANDARD; it simply means no value was recorded either way.