sdk gcloud migration

The standalone App Engine SDK was deprecated as of July 30, 2019, and it is now shut down. The following table lists features and their recommended alternatives:

Deprecated	Recommended action
standalone App Engine SDK	Download gcloud CLI
Access App Engine legacy APIs using the App Engine SDK	Migrate to an unbundled Google Cloud or third-party service, or access bundled services using the {{gae_services_sdk}} if you are using a second-generation runtime
`appcfg` commands	Migrate from AppCfg to gcloud command line
`dev_appserver.sh` commands	For local development, run the `java_dev_appserver.sh` command from the bin directory of gcloud CLI
Java App Engine SDK-based plugin for Maven (`com.google.appengine.appengine-maven`)	Migrate to the gcloud CLI-based Maven plugin
Java App Engine SDK-based plugin for Gradle (`com.google.appengine.appengine-gradle`)	Migrate to the gcloud CLI-based Gradle plugin
`cron.xml`, `datastore-index.xml`, `dispatch.xml`, and `queue.xml` file formats	Migrate automatically using the `gcloud beta app migrate-config` tool or migrate your `xml` to `yaml` files manually.

## Migration timetable

July 30, 2019: The standalone App Engine SDK-based tooling is deprecated. August 30, 2020: The standalone App Engine SDK is not available for download and might not work, if used. August 30, 2020: Google shut down and removed support for the standalone App Engine SDK.

Backward non-compatible features

As a result of the shutdown of the appcfg tool and the standalone App Engine SDK, the following features are currently not supported in gcloud CLI:

• Downloads of your application's files with AppCfg.