How to automatically delete old instances of the version of the Google App Engine application?

Question

I am experimenting with more economical ways to deploy Rails applications and go through Ruby Starter Projects to get a feel for the Google Cloud Platform.

It is almost perfect and certainly competitive in price, but I cannot figure out how to automatically delete old deployed version instances after redistribution.

ie: let's say I have one version of each instance:

And then I make changes to my application and relocate with:

$ gcloud preview app deploy app.yaml worker.yaml --promote

So now I have two versions of each deployed instance (since Google switches between them wisely, I would suggest):

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Answer 1

- ( , ), control, Python, API modules:

from google.appengine.api.modules import modules

# core logic (inside a cron or other handler)
for m in modules.get_modules():
    dv = modules.get_default_version(m)
    for v in modules.get_versions(m):
        if v != dv: modules.stop_version(m, v)

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Answer 2

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Answer 3

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https://pypi.org/project/appengine-clean/