More flexibility for each initiative is at the core of stakes.
Now you can use the Admin API not only to deploy new versions and manage traffic for any service, but also to change various configuration settings of your application, such as instance class.
You can also stop individual versions in order to scale your App Engine Flexible environment deployments to zero.
It is also indispensable to recall that, the API allows you to deploy several App Engine services in parallel, speeding up your deployments.
You can also use the Google APIs explorer to easily test-drive the API and get a feel for what it offers.
For those who are unfamiliar, Google App Engine provides easy ways to manage your application from the Google Cloud Platform Console or the command line.