PCD Deploying applications Practice Question
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?
⚠ Common exam trap
It's easy for candidates to 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.
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
✓
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.
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCD practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCD exam.