Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of a cloud solution. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is using Cloud Run for a stateless application. The application sometimes fails with HTTP 503 errors when traffic spikes. Which action should the team take to improve reliability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the maximum number of container instances.
HTTP 503 errors during traffic spikes indicate that Cloud Run is scaling out but hitting the maximum number of container instances limit, causing new requests to be rejected. Increasing the maximum number of container instances allows Cloud Run to spin up more concurrent containers to handle the burst, directly improving reliability under load.
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.
✗
Configure a liveness probe with a higher initial delay.
Why it's wrong here
Liveness probe determines if container is healthy; doesn't increase capacity.
✓
Increase the maximum number of container instances.
Why this is correct
Increasing the max instances allows more concurrent requests, reducing 503s.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Cloud Functions instead of Cloud Run.
Why it's wrong here
Both scale but Cloud Functions may have cold starts; not addressing capacity issue directly.
✗
Enable HTTP load balancing with Cloud CDN.
Why it's wrong here
Cloud CDN caches content but does not increase compute capacity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse liveness probes (which check container health) with scaling mechanisms, or assume that adding a CDN or switching to Cloud Functions will magically absorb traffic spikes, when the root cause is simply hitting the instance cap.
Detailed technical explanation
How to think about this question
Cloud Run's default maximum container instances is 250 per revision, and when all instances are saturated, new requests receive a 503 response. The `max-instances` setting can be adjusted via the `--max-instances` flag in `gcloud run deploy` or in the console; note that increasing this limit may require a corresponding increase in your Cloud Run region's quota for CPU and memory. In a real-world scenario, a flash crowd hitting a serverless API could exhaust the default instance pool within seconds, making this tuning critical for production workloads.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the maximum number of container instances. — HTTP 503 errors during traffic spikes indicate that Cloud Run is scaling out but hitting the maximum number of container instances limit, causing new requests to be rejected. Increasing the maximum number of container instances allows Cloud Run to spin up more concurrent containers to handle the burst, directly improving reliability under load.
What should I do if I get this ACE 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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