- A
Embed the feature flag logic in the application code and use environment variables to enable it.
Why wrong: That couples release to deployment, not the decoupled approach described.
- B
Use Cloud Build substitution variables to set the feature flag status at build time.
Why wrong: Build-time variables are fixed; cannot enable after verification.
- C
Use Config Sync to update a ConfigMap with the flag status.
Why wrong: Config Sync is for cluster state, not feature flag management.
- D
Use Cloud Deploy hooks to call the LaunchDarkly API after the deployment succeeds.
Cloud Deploy hooks can trigger external actions, such as enabling a feature flag via API.
Question 938 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.
You are designing a CI/CD pipeline for a microservice application that uses feature flags to decouple deployment from release. The team wants to automatically enable a feature flag after the deployment is verified in production for a subset of users. Which tool or approach should you integrate into the pipeline to manage feature flags?
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 Cloud Deploy hooks to call the LaunchDarkly API after the deployment succeeds.
Option D is correct because it uses Cloud Deploy hooks to trigger a post-deployment action that calls the LaunchDarkly API, enabling the feature flag for a subset of users after the deployment has been verified in production. This decouples deployment from release, allowing the feature flag to be toggled dynamically without redeploying or modifying the application 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.
- ✗
Embed the feature flag logic in the application code and use environment variables to enable it.
Why it's wrong here
That couples release to deployment, not the decoupled approach described.
- ✗
Use Cloud Build substitution variables to set the feature flag status at build time.
Why it's wrong here
Build-time variables are fixed; cannot enable after verification.
- ✗
Use Config Sync to update a ConfigMap with the flag status.
Why it's wrong here
Config Sync is for cluster state, not feature flag management.
- ✓
Use Cloud Deploy hooks to call the LaunchDarkly API after the deployment succeeds.
Why this is correct
Cloud Deploy hooks can trigger external actions, such as enabling a feature flag via API.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common pitfall in Google PCDE exams is confusing build-time, deploy-time, and runtime configuration management. The trap here is assuming that environment variables or build-time substitution variables can handle post-deployment feature flag toggling, when in fact they require a new build or redeployment to take effect.
Detailed technical explanation
How to think about this question
Cloud Deploy hooks allow you to run custom actions (e.g., using Cloud Functions or Cloud Run jobs) at specific lifecycle stages of a delivery pipeline, such as after a deployment succeeds. LaunchDarkly's REST API (e.g., PATCH /api/v2/flags/{project}/{flag}/targets) enables precise percentage-based rollouts or user targeting, which can be invoked from a hook to gradually release the feature. This approach avoids the latency and complexity of redeploying or restarting services, and it integrates seamlessly with progressive delivery strategies like canary releases.
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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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 Cloud Deploy hooks to call the LaunchDarkly API after the deployment succeeds. — Option D is correct because it uses Cloud Deploy hooks to trigger a post-deployment action that calls the LaunchDarkly API, enabling the feature flag for a subset of users after the deployment has been verified in production. This decouples deployment from release, allowing the feature flag to be toggled dynamically without redeploying or modifying the application code.
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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