If you just have a context, than your app cannot kill itself and the environment has to do it. That is better than nothing, but having the app do the killing is

If you just have a context, than your app cannot kill itself and the environment has to do it. That is better than nothing, but having the app do the killing is advantageous because: A) it can die faster (and so you can e.g. do your blue-green rollout faster) and B) you can write a log to say that your app is finished shutting down all its components, which can be useful for troubleshooting if your app was mid-transaction when it was killed.