are, unning instances using old versions of an applications, chargable ?

[Pardeep Aulakh]

There are lot of instances running which are using old versions of my application. Are these instances chargable, given that they are not serving any amount of traffic ?

[Aref Amiri (Cloud Platform Support)]

Yes, you will be charged for the instances running your old version of your application, as GAE instance are billed at hourly rates based on instance uptime. You can find more information on pricing here. However, if you are looking to lower the resources costs, you can look into Google Cloud Run, as the charges are only for the resources you use, rounded up to the nearest 100 millisecond.