gcloud alpha alloydb endpoints update

INFORMATION
gcloud alpha alloydb endpoints update is not available in universe domain universe.
NAME
gcloud alpha alloydb endpoints update - update an AlloyDB endpoint
SYNOPSIS
gcloud alpha alloydb endpoints update ENDPOINT --region=REGION --target-instances=[TARGET_INSTANCES,…] [--async] [GCLOUD_WIDE_FLAG …]
DESCRIPTION
(ALPHA) Update an AlloyDB endpoint.
EXAMPLES
To update an endpoint, run: 
gcloud alpha alloydb endpoints update my-endpoint --region=us-central1 --target-instances=projects/my-project/locations/us-central1/clusters/my-cluster/instances/my-instance-1,projects/my-project/locations/us-central1/clusters/my-cluster/instances/my-instance-2
POSITIONAL ARGUMENTS
ENDPOINT
AlloyDB endpoint ID
REQUIRED FLAGS
--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.
--target-instances=[TARGET_INSTANCES,…]
Comma-separated list of target instances that the endpoint will direct traffic to.For example, --target-instances=projects/my-project/locations/us-central1/clusters/my-cluster/instances/my-instance.For WRITE endpoint, only one target instance is allowed.
OPTIONAL FLAGS
--async
Return immediately, without waiting for the operation in progress to complete.
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 alloydb endpoints update