running instances serving old versions of an application in google app engine

[Pardeep Aulakh]

Do app engine charge for the running instances which serves old versions of my application, though those old instances are not serving any amount of traffic.

[George (Cloud Platform Support)]

Hello Pardeep, 

Do you refer to App Engine Standard Environment? When an application is not being used at all, App Engine turns off its associated dynamic instances, but readily reloads them as soon as they are needed. Reloading instances can result in loading requests and additional latency for users. In your case, if you have old versions not serving any traffic, no instances are running, so no related costs are incurred. Applications running in the App Engine standard environment are deployed to instance classes that you specify. Costs are per hour per instance, so no costs are incurred with no instance running. You may gather more detail from the "App Engine Pricing" page. You may also use the Pricing Calculator. 

[Pardeep Aulakh]

Hello George,

Thanks for your reply. When a particular version of an application is not used, App Engine turns off its associated instances (standard env). But when I go to my app dashboard I can still see instances running, which are associated with old versions of the application. Is there any particular scenario where it doesn't turn off some of the instances and do we need to manually clean those instances in that scenario?

On Wed, Sep 18, 2019 at 12:46 AM 'George (Cloud Platform Support)' via Google App Engine <google-a...@googlegroups.com> wrote:

Hello Pardeep, 

Do you refer to App Engine Standard Environment? When an application is not being used at all, App Engine turns off its associated dynamic instances, but readily reloads them as soon as they are needed. Reloading instances can result in loading requests and additional latency for users. In your case, if you have old versions not serving any traffic, no instances are running, so no related costs are incurred. Applications running in the App Engine standard environment are deployed to instance classes that you specify. Costs are per hour per instance, so no costs are incurred with no instance running. You may gather more detail from the "App Engine Pricing" page. You may also use the Pricing Calculator. 

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[Elliott (Cloud Platform Support)]

Hello Pardeep,

If instances receive requests, they will run. In this scenario, you would manually need to clean those instances.