- A
Use the --to-revisions flag with gcloud run deploy to assign traffic percentages.
This allows sending a percentage of traffic to the new revision for canary testing.
- B
Deploy two separate Cloud Run services and use a global load balancer.
Why wrong: This is overly complex; Cloud Run supports traffic splitting within a single service.
- C
Use Cloud Deploy with a canary strategy.
Why wrong: Cloud Deploy can orchestrate canary deployments on GKE or Cloud Run, but for a single Cloud Run service, traffic splitting is simpler.
- D
Use Cloud Load Balancing with a backend bucket to split traffic.
Why wrong: Cloud Load Balancing is not directly used for Cloud Run traffic splitting; Cloud Run's built-in traffic management is more appropriate.
Question 846 of 1,000
PCDE Practice Question: Building and Implementing CI/CD Pipelines for a Service
This PCDE practice question tests your understanding of building and implementing ci/cd pipelines for a service. 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.
An organization is deploying a containerized application to Cloud Run. They want to gradually roll out a new revision to 10% of traffic, monitor for errors, and then fully promote if stable. Which Cloud Run feature 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
✓
Use the --to-revisions flag with gcloud run deploy to assign traffic percentages.
The `--to-revisions` flag with `gcloud run deploy` allows you to specify traffic percentages for revisions in a single Cloud Run service. This enables a gradual rollout by sending 10% of traffic to the new revision, monitoring for errors, and then promoting it to 100% without deploying a separate service or using external load balancers.
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.
- ✓
Use the --to-revisions flag with gcloud run deploy to assign traffic percentages.
Why this is correct
This allows sending a percentage of traffic to the new revision for canary testing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy two separate Cloud Run services and use a global load balancer.
Why it's wrong here
This is overly complex; Cloud Run supports traffic splitting within a single service.
- ✗
Use Cloud Deploy with a canary strategy.
Why it's wrong here
Cloud Deploy can orchestrate canary deployments on GKE or Cloud Run, but for a single Cloud Run service, traffic splitting is simpler.
- ✗
Use Cloud Load Balancing with a backend bucket to split traffic.
Why it's wrong here
Cloud Load Balancing is not directly used for Cloud Run traffic splitting; Cloud Run's built-in traffic management is more appropriate.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between native Cloud Run traffic splitting and external tools like Cloud Deploy or Load Balancers, expecting candidates to recognize that Cloud Run's built-in `--to-revisions` flag is the simplest and most direct method for gradual rollouts.
Detailed technical explanation
How to think about this question
Cloud Run's traffic splitting works by assigning a percentage of incoming requests to each revision via the `spec.traffic` field in the service's YAML configuration. The `--to-revisions` flag updates this field atomically, and the split is enforced at the Cloud Run ingress layer using HTTP headers like `X-Cloud-Trace-Context` for request routing. In a real-world scenario, you can use this with Cloud Monitoring to set up error-rate alerts that automatically roll back the canary revision if the error budget is exceeded.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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.
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Building and Implementing CI/CD Pipelines for a Service — study guide chapter
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FAQ
Questions learners often ask
What does this PCDE question test?
Building and Implementing CI/CD Pipelines for a Service — This question tests Building and Implementing CI/CD Pipelines for a Service — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the --to-revisions flag with gcloud run deploy to assign traffic percentages. — The `--to-revisions` flag with `gcloud run deploy` allows you to specify traffic percentages for revisions in a single Cloud Run service. This enables a gradual rollout by sending 10% of traffic to the new revision, monitoring for errors, and then promoting it to 100% without deploying a separate service or using external load balancers.
What should I do if I get this PCDE 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: Jul 4, 2026
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