gcloud alpha sql blue-green-deployments delete

INFORMATION
gcloud alpha sql blue-green-deployments delete is not available in universe domain universe.
NAME
gcloud alpha sql blue-green-deployments delete - deletes a Cloud SQL blue-green deployment
SYNOPSIS
gcloud alpha sql blue-green-deployments delete DEPLOYMENT [--async] [--delete-old-source] [--region=REGION] [GCLOUD_WIDE_FLAG …]
DESCRIPTION
(ALPHA) Deletes a Cloud SQL blue-green deployment.
EXAMPLES
To delete a blue-green deployment named my-deployment in region us-central1: 
gcloud alpha sql blue-green-deployments delete my-deployment --region=us-central1

To delete a blue-green deployment and delete the old source instance after a successful switchover: 

gcloud alpha sql blue-green-deployments delete my-deployment --region=us-central1 --delete-old-source
POSITIONAL ARGUMENTS
DEPLOYMENT
The ID of the blue-green deployment.
FLAGS
--async
Return immediately, without waiting for the operation in progress to complete.
--delete-old-source
Delete the old source instance. This flag is only applicable when deleting a deployment after a switchover has been successfully completed.

If deleting a deployment before switchover or after a failed switchover, the target instance will be deleted by default, and this flag will be ignored.

--region=REGION
Regional location (e.g. asia-east1, us-east1). See the full list of regions at https://cloud.google.com/sql/docs/instance-locations.
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.

NOTES
This command is currently in alpha and might change without notice. If this command fails with API permission errors despite specifying the correct project, you might be trying to access an API with an invitation-only early access allowlist. This variant is also available: 
gcloud beta sql blue-green-deployments delete