gcloud app deploy does not remove previous versions

Question

I am running a Node.js app on Google App Engine, using the following command to deploy my code:

gcloud app deploy --stop-previous-version

My de

Answer 1

Google may have updated their documentation cited in @IAmKale's answer

Note that if the version is running on an instance of an auto-scaled service, using --stop-previous-version will not work and the previous version will continue to run because auto-scaled service instances are always running.

Seems like that flag only works with manually scaled services.