Hello Nikos, You seem to want to stop your default service, which is not possible. This is why your button is greyed out. To stop this service, you need to redeploy your app with an empty application, and create an app.yaml that uses only static files. Once this is done, you can stop your app using thegcloud app versions stop VERSION_ID, where "VERSION_ID" is the version of the newly deployed empty application.
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