This PCD practice question tests your understanding of deploying applications. 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.
A company has a multi-region Cloud Run service with traffic splitting between revisions. They notice that a newly rolled-out revision is receiving 0% of traffic even though they set traffic to 100% via the console. The revision shows 'Ready: Yes'. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The revision has a tag but no traffic percentage assigned; the tag is being used for routing.
When a revision shows 'Ready: Yes' but receives 0% traffic despite setting 100% via the console, the most likely cause is that the revision has a tag assigned but no traffic percentage. In Cloud Run, tags are used for direct URL routing (e.g., for testing) and do not receive any traffic from the service's main URL unless a traffic percentage is explicitly assigned. The console's traffic splitting UI allows setting a tag without a percentage, which can lead to this confusion.
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.
✗
The revision has a low CPU limit causing it to be throttled.
Why it's wrong here
CPU limits affect performance, not traffic routing.
✗
The revision is not healthy because of a misconfigured health check.
Why it's wrong here
The revision shows 'Ready: Yes', so it is healthy.
✓
The revision has a tag but no traffic percentage assigned; the tag is being used for routing.
Why this is correct
If a revision has a tag, it may be accessible only via that URL; without a traffic percentage, it won't serve at the default URL.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The revision has a concurrency setting of 0, which is invalid.
Why it's wrong here
Concurrency of 0 is not allowed; but even if misconfigured, it wouldn't set traffic to 0.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume setting traffic to 100% in the console automatically distributes traffic to the latest revision, but they overlook that a tag can override this behavior by creating a separate routing path without a traffic percentage.
Trap categories for this question
Command / output trap
The revision shows 'Ready: Yes', so it is healthy.
Detailed technical explanation
How to think about this question
Cloud Run revisions can have both a traffic percentage and a tag. Tags are used to generate a unique URL (e.g., https://tag---service-hash-uc.a.run.app) for direct access without affecting the main service URL's traffic distribution. When a revision is tagged but not assigned a traffic percentage, it receives 0% of the main service traffic, which is a common pattern for canary testing or staging. The 'Ready: Yes' status confirms the revision is healthy and can serve requests via its tag URL, but it will not receive any traffic from the service's default route unless a percentage is explicitly set.
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.
Deploying applications — This question tests Deploying applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The revision has a tag but no traffic percentage assigned; the tag is being used for routing. — When a revision shows 'Ready: Yes' but receives 0% traffic despite setting 100% via the console, the most likely cause is that the revision has a tag assigned but no traffic percentage. In Cloud Run, tags are used for direct URL routing (e.g., for testing) and do not receive any traffic from the service's main URL unless a traffic percentage is explicitly assigned. The console's traffic splitting UI allows setting a tag without a percentage, which can lead to this confusion.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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