Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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.
Exhibit
SLO History for last 30 days:
Service: payments-api
SLO: 99.9% availability over 30 days
Compliance: 99.89%
Error budget remaining: 0%
Burn rate: 2.5 over last 1 hour
Alert: Error budget exhausted
Refer to the exhibit. The SLO for the payments-api service is 99.9% availability over 30 days. The current compliance is 99.89% and the error budget is exhausted. Which action should the SRE team take FIRST?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
SLO History for last 30 days:
Service: payments-api
SLO: 99.9% availability over 30 days
Compliance: 99.89%
Error budget remaining: 0%
Burn rate: 2.5 over last 1 hour
Alert: Error budget exhausted
A
Increase the SLO target to 99.99% to reduce future burn rate.
Why wrong: Increasing the SLO target would make it harder to meet, not easier.
B
Pause all non-critical deployments and investigate the cause of the increased error rate.
This aligns with error budget policy: when budget is exhausted, slow down or stop deployments to prevent further errors.
C
Trigger a rollback of the latest deployment to stabilize the service.
Why wrong: Rolling back might help, but the first step should be to stop any changes that could worsen the situation.
D
Scale up the service to handle more traffic and reduce error rate.
Why wrong: Scaling may not address the root cause and could be resource-intensive; investigation is needed first.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pause all non-critical deployments and investigate the cause of the increased error rate.
With the error budget exhausted and a high burn rate, the team should immediately stop all non-critical deployments to prevent further degradation and allow the error budget to recover.
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.
✗
Increase the SLO target to 99.99% to reduce future burn rate.
Why it's wrong here
Increasing the SLO target would make it harder to meet, not easier.
✓
Pause all non-critical deployments and investigate the cause of the increased error rate.
Why this is correct
This aligns with error budget policy: when budget is exhausted, slow down or stop deployments to prevent further errors.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Trigger a rollback of the latest deployment to stabilize the service.
Why it's wrong here
Rolling back might help, but the first step should be to stop any changes that could worsen the situation.
✗
Scale up the service to handle more traffic and reduce error rate.
Why it's wrong here
Scaling may not address the root cause and could be resource-intensive; investigation is needed first.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Scenario analysis trap
Rolling back might help, but the first step should be to stop any changes that could worsen the situation.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Pause all non-critical deployments and investigate the cause of the increased error rate. — With the error budget exhausted and a high burn rate, the team should immediately stop all non-critical deployments to prevent further degradation and allow the error budget to recover.
What should I do if I get this PCA question wrong?
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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