PDE Maintaining and Automating Data Workloads Practice Question
A data engineer needs to alert when Pub/Sub subscription has messages older than 1 hour. Which Cloud Monitoring metric and filter should they use?
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
✓
Metric: subscription/oldest_unacked_message_age; filter: subscription_id
The metric subscription/oldest_unacked_message_age gives the age of the oldest unacknowledged message. Filtering by subscription ID targets the specific subscription.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Metric: topic/send_message_operation_count; filter: topic_id
Why it's wrong here
Topic metrics don't measure subscription backlog age.
- ✗
Metric: subscription/ack_message_count; filter: subscription_id
Why it's wrong here
ack_message_count is throughput, not age.
- ✗
Metric: subscription/num_undelivered_messages; filter: subscription_id
Why it's wrong here
num_undelivered_messages gives count, not age.
- ✓
Metric: subscription/oldest_unacked_message_age; filter: subscription_id
Why this is correct
Correct metric and filter for alerting on message age.
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JA
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.