- A
Define a Cloud Deploy deployment policy with a rollout policy that uses a canary strategy and a verification phase with automated rollback
Cloud Deploy deployment policies can automate rollback based on criteria like error rate thresholds.
- B
Configure a Pub/Sub notification on the rollout to trigger a rollback via a Cloud Function
Why wrong: Pub/Sub notifications only notify; they don't automatically rollback without custom logic.
- C
Use Cloud Monitoring to create an alert policy that triggers a Cloud Function to rollback the deployment
Why wrong: This is an external solution; Cloud Deploy has native rollback automation.
- D
Set up a Cloud Build trigger to rebuild the previous image on error
Why wrong: Cloud Build builds images, but does not manage deployment rollback.
Quick Answer
The answer is to define a Cloud Deploy deployment policy with a rollout policy that uses a canary strategy and a verification phase with automated rollback. This configuration is correct because Cloud Deploy’s verification phase acts as a health gate that monitors the error rate after the canary is deployed; when the threshold—such as a 10% increase within 5 minutes—is breached, the platform automatically triggers a rollback to the last known stable revision, eliminating the need for custom scripting. On the Google Professional Cloud Developer exam, this scenario tests your understanding of how Cloud Deploy’s native deployment policies abstract complex release orchestration, often appearing as a distractor where candidates mistakenly choose manual rollback steps or separate monitoring tools. A common trap is assuming you need Cloud Monitoring alerts to initiate the rollback, but Cloud Deploy’s verification phase handles this natively. Memory tip: think “Canary + Verification = Auto-Rollback” to remember that the verification phase is the automated safety net for canary releases.
PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A development team wants to implement a CI/CD pipeline for a containerized application on Google Cloud. They are using Cloud Build and Cloud Deploy. The application requires canary deployments with automatic rollback if the error rate increases by more than 10% within 5 minutes after deployment. Which Cloud Deploy feature should they configure?
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
Define a Cloud Deploy deployment policy with a rollout policy that uses a canary strategy and a verification phase with automated rollback
Option A is correct because Cloud Deploy's deployment policies allow you to define a canary rollout strategy with an automated verification phase. When the verification phase detects that the error rate exceeds the defined threshold (e.g., 10% increase within 5 minutes), Cloud Deploy automatically initiates a rollback to the previous stable revision, meeting the team's requirement without additional custom code.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Define a Cloud Deploy deployment policy with a rollout policy that uses a canary strategy and a verification phase with automated rollback
Why this is correct
Cloud Deploy deployment policies can automate rollback based on criteria like error rate thresholds.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure a Pub/Sub notification on the rollout to trigger a rollback via a Cloud Function
Why it's wrong here
Pub/Sub notifications only notify; they don't automatically rollback without custom logic.
- ✗
Use Cloud Monitoring to create an alert policy that triggers a Cloud Function to rollback the deployment
Why it's wrong here
This is an external solution; Cloud Deploy has native rollback automation.
- ✗
Set up a Cloud Build trigger to rebuild the previous image on error
Why it's wrong here
Cloud Build builds images, but does not manage deployment rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume external monitoring and custom functions (Options B and C) are required for automated rollbacks, overlooking Cloud Deploy's native deployment policy feature that directly supports canary rollouts with automated rollback based on verification phase conditions.
Detailed technical explanation
How to think about this question
Cloud Deploy deployment policies use a 'verification' phase that runs after the canary deployment reaches a specified percentage of traffic. The verification phase can include custom metrics or log-based conditions; if the condition fails (e.g., error rate spike), Cloud Deploy automatically executes a 'rollback' strategy, which reverts the rollout to the last known good revision. Under the hood, Cloud Deploy uses the Skaffold framework to manage the progression and can integrate with Cloud Operations for metric evaluation.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCD question test?
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Define a Cloud Deploy deployment policy with a rollout policy that uses a canary strategy and a verification phase with automated rollback — Option A is correct because Cloud Deploy's deployment policies allow you to define a canary rollout strategy with an automated verification phase. When the verification phase detects that the error rate exceeds the defined threshold (e.g., 10% increase within 5 minutes), Cloud Deploy automatically initiates a rollback to the previous stable revision, meeting the team's requirement without additional custom code.
What should I do if I get this PCD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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