PCDOE Managing service incidents Practice Question
This PCDOE practice question tests your understanding of managing service incidents. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Your team uses a canary deployment strategy on Google Kubernetes Engine (GKE). During a rollback, you notice that the rollback caused a brief period of downtime because the previous version's readiness probe was not properly configured. Which of the following best prevents this issue in the future?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure that the readiness probe is tested as part of the pre-deployment validation.
Option C is correct because the root cause of the downtime was a misconfigured readiness probe on the previous version. By testing the readiness probe as part of pre-deployment validation, you ensure that the probe correctly reflects the application's ability to serve traffic before it is used in a rollback. This prevents the scenario where a rollback deploys a version that fails its readiness check, causing the service to be removed from the load balancer and resulting in downtime.
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.
✗
Perform a gradual rollback with a managed instance group.
Why it's wrong here
MIGs are not used in GKE; this is not applicable.
✗
Use a blue/green deployment instead.
Why it's wrong here
Blue/green also relies on probes; the same issue could occur.
✓
Ensure that the readiness probe is tested as part of the pre-deployment validation.
Why this is correct
Validating probes before deployment ensures both new and old versions are ready.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a Kubernetes Job to run a post-deployment validation.
Why it's wrong here
Post-deployment validation is good but does not prevent the initial issue during rollback.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that changing deployment strategies (like blue/green or canary) solves all rollback issues, when in fact the real problem is a misconfigured health check that must be validated before the rollback is executed.
Detailed technical explanation
How to think about this question
Readiness probes in GKE are implemented as HTTP GET, TCP socket, or exec checks against the container. If a probe fails, the kubelet marks the Pod as NotReady, and the EndpointSlice controller removes the Pod's IP from the Service's endpoints, causing traffic loss. Pre-deployment validation should include a dry-run or canary test that verifies the probe returns HTTP 200 within the configured periodSeconds (default 10) and failureThreshold (default 3) to ensure the application is truly ready before being promoted. In a rollback scenario, the previous version's probe may have been written for a different application state (e.g., expecting a database that no longer exists), so testing it in isolation prevents the outage.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Managing service incidents — This question tests Managing service incidents — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure that the readiness probe is tested as part of the pre-deployment validation. — Option C is correct because the root cause of the downtime was a misconfigured readiness probe on the previous version. By testing the readiness probe as part of pre-deployment validation, you ensure that the probe correctly reflects the application's ability to serve traffic before it is used in a rollback. This prevents the scenario where a rollback deploys a version that fails its readiness check, causing the service to be removed from the load balancer and resulting in downtime.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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