PCDOE Managing service incidents Practice Question
This PCDOE practice question tests your understanding of managing service incidents. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
After deploying a new version of a Cloud Run service, the team notices an increase in 5xx errors. They want to quickly revert to the previous version while minimizing user impact. What is the recommended approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Cloud Run's traffic management to set 100% of traffic to the previous revision.
Cloud Run supports traffic splitting between revisions, allowing you to instantly route 100% of traffic to the previous revision without redeploying. This minimizes user impact because the rollback is immediate and does not require rebuilding or re-pulling container images. Option D is correct because it leverages Cloud Run's built-in traffic management feature for zero-downtime rollbacks.
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.
✗
Set the minimum number of instances of the new revision to 0.
Why it's wrong here
Does not redirect traffic; new revision still receives requests.
✗
Redeploy the previous version from the container registry.
Why it's wrong here
Creates a new revision; not instantaneous.
✗
Modify the ingress settings to restrict traffic to the new revision.
Why it's wrong here
Ingress settings affect all revisions, not just new one.
✓
Use Cloud Run's traffic management to set 100% of traffic to the previous revision.
Why this is correct
Traffic splitting achieves instant rollback.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that you must redeploy or delete a revision to roll back, when in fact Cloud Run's traffic management allows instant, traffic-level rollbacks without any deployment action.
Detailed technical explanation
How to think about this question
Cloud Run revisions are immutable and each gets a unique URL; traffic management uses a weighted routing mechanism that can be adjusted via the gcloud CLI, API, or console. Under the hood, Cloud Run updates the Knative Serving configuration to change the traffic target, which is then reconciled by the control plane to update the underlying Istio or Envoy proxy routing rules. In a real-world scenario, if a new revision introduces a memory leak causing 5xx errors, shifting traffic back to the stable revision immediately restores service while you debug the faulty revision.
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: Use Cloud Run's traffic management to set 100% of traffic to the previous revision. — Cloud Run supports traffic splitting between revisions, allowing you to instantly route 100% of traffic to the previous revision without redeploying. This minimizes user impact because the rollback is immediate and does not require rebuilding or re-pulling container images. Option D is correct because it leverages Cloud Run's built-in traffic management feature for zero-downtime rollbacks.
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.
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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