PDE Maintaining and Automating Data Workloads Practice Question
You need to monitor the health of a Pub/Sub subscription that feeds into a Dataflow pipeline. Which TWO Cloud Monitoring metrics are most relevant to detect if messages are not being acknowledged promptly? (Choose 2)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
subscription/oldest_unacked_message_age
The metric `subscription/num_undelivered_messages` indicates the number of messages not yet delivered/acknowledged. `subscription/oldest_unacked_message_age` shows the age of the oldest unacknowledged message, indicating backlogs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
subscription/num_outstanding_messages
Why it's wrong here
This is not a standard metric name; the correct one is num_undelivered_messages.
- ✓
subscription/oldest_unacked_message_age
Why this is correct
This metric indicates how long messages have been waiting for acknowledgment.
- ✗
topic/send_request_count
Why it's wrong here
This metric measures publish requests, not acknowledgment health.
- ✗
subscription/ack_message_count
Why it's wrong here
This counts successful acknowledgments, but does not indicate backlog or delay.
- ✓
subscription/num_undelivered_messages
Why this is correct
This metric shows the backlog of messages not yet delivered/acknowledged.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PDE exam.