1. Open the Google Cloud Console and select the project that contains the Pub/Sub subscription that needs to be remediated.
2. In the left-hand navigation menu, select “Pub/Sub” and then select “Subscriptions”.
3. Find the subscription that needs to be remediated and click on its name to open its details page.
4. Scroll down to the “Dead-letter topic” section and click on the “Edit” button.
5. In the “Edit dead-letter topic” dialog box, select the topic that will be used as the dead-letter queue for failed messages.
6. Click on the “Save” button to confirm the changes.
7. Verify that the dead-letter topic has been set correctly by checking the subscription details page.

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1. Open the Cloud Shell in the GCP Console.
2. Run the following command to set up a dead letter topic:

gcloud pubsub topics create [DEAD_LETTER_TOPIC_NAME]

3. Run the following command to create a subscription with a dead letter topic:

gcloud pubsub subscriptions create [SUBSCRIPTION_NAME] --topic [TOPIC_NAME] --dead-letter-topic [DEAD_LETTER_TOPIC_NAME]

4. Verify that the subscription was created with the dead letter topic by running the following command:

gcloud pubsub subscriptions describe [SUBSCRIPTION_NAME]

1. First, you need to create a Dead Letter Queue (DLQ) topic in GCP Pub/Sub. To do this, use the following code:

from google.cloud import pubsub_v1

project_id = "your-project-id"
topic_name = "your-dlq-topic-name"

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_name)

topic = publisher.create_topic(request={"name": topic_path})
print("Created topic: {}".format(topic.name))

2. Once the DLQ topic is created, you need to update the subscription to use this DLQ topic for failed messages. To do this, use the following code:

subscription_name = "your-subscription-name"
subscription_path = publisher.subscription_path(project_id, subscription_name)

update_mask = {"paths": ["dead_letter_policy.dead_letter_topic"]}

dead_letter_policy = {
    "dead_letter_topic": topic_path,
    "max_delivery_attempts": 5
}

subscription = publisher.update_subscription(
    request={
        "subscription": subscription_path,
        "update_mask": update_mask,
        "dead_letter_policy": dead_letter_policy
    }
)

print("Updated subscription: {}".format(subscription.name))

3. Finally, you can verify that the DLQ topic is set for the subscription using the following code:

subscription = publisher.get_subscription(request={"subscription": subscription_path})
print("Subscription: {}".format(subscription.name))
print("DLQ topic: {}".format(subscription.dead_letter_policy.dead_letter_topic))