I have deployed multiple versions of my web app to Google App Engine. On the new Google App Engine Dashboard, I was unable to find where to set a version as the default version of the app. The old GAE console allows us to click the "Make Default" button but it disappears from the new Dashboard.
In the Google Cloud console, go to the IAM page. Select your project. Locate the App Engine default service account in the Principals list. The App Engine default service account appears in the list if roles have been automatically or manually granted to the service account.
The only way you can delete the default version of your App Engine app is by deleting your project. However, you can stop the default version in the GCP Console. This action shuts down all instances associated with the version. You can restart these instances later if needed.
The standard environment can scale from zero instances up to thousands very quickly. In contrast, the flexible environment must have at least one instance running for each active version and can take longer to scale up in response to traffic. Standard environment uses a custom-designed autoscaling algorithm.
In the developer console select App Engine > Versions.
Select the version you wish to use then > Migrate Traffic (at the top of page).
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