Not familiar with the specific terminology of Kubernetes (pets, sets, etc) but does this allow you configure the shutdown behavior of containers? There's a Mesos feature I saw discussed where you can tell it to ping a endpoint in your application and not terminate the container until it says it is OK / safe to do so - is the same possible in Kubernetes? Want to do a blue-green type deployment pattern but the old application containers cannot be shutdown until all sessions are terminated (maybe even up to 15 minutes).