The goal is to pull (fetch) messages from a subscription and acknowledge them.
The gcloud pubsub subscriptions **pull** command retrieves messages from a specified subscription.
The --auto-ack flag instructs the command to automatically acknowledge the messages after they are successfully retrieved, combining the two required actions into one command.
[Reference: Google Cloud Documentation - gcloud pubsub subscriptions pull:, "Pulls one or more messages from the specified subscription. To acknowledge the pulled messages, use the --auto-ack flag.", , , ]
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