Answer-first summary for fast verification
Answer: subscription/num_undelivered_messages
The `subscription/num_undelivered_messages` metric accurately reflects the number of messages that have not been delivered, serving as a key indicator of whether subscribers are processing messages at the rate they are being ingested. This metric is specific to subscriptions, not topics, and there is no such metric as `excess_ingestion_rate`. For more details, refer to [Cloud Pub/Sub Monitoring Documentation](https://cloud.google.com/pubsub/docs/monitoring).
Author: LeetQuiz Editorial Team
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A developer is setting up a dashboard to oversee a service utilizing Cloud Pub/Sub. They aim to detect when applications consuming data from a pull subscription in Cloud Pub/Sub fail to process messages as quickly as they are being ingested. Which metric should they monitor to identify this issue?
A
topic/excess_ingestion_volume
B
subscription/num_undelivered_messages
C
topic/num_undelivered_messages
D
subscription/excess_ingestion_volume
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