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.
Your team manages a service with a 99.9% uptime SLO over a 30-day window. The error budget for this period is 43 minutes. In the first week, outages consumed 30 minutes of the budget. You are planning a new release. What should you do?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Delay the release and focus on improving reliability to rebuild the error budget.
With only 13 minutes of error budget remaining after the first week, proceeding with the release (Option B) risks exhausting the budget entirely from any unforeseen issues, violating the 99.9% SLO. Delaying the release (Option C) allows the team to focus on reliability improvements, such as implementing canary deployments, adding circuit breakers, or enhancing monitoring with tools like Prometheus and Grafana, to rebuild the error budget over the remaining 23 days. This aligns with the principle of using error budgets to balance innovation with reliability, as defined in Google's SRE practices.
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.
✗
Reduce the SLO to 99.8% to increase the error budget.
Proceed with the release because the remaining budget is sufficient.
Why it's wrong here
13 minutes is a small buffer; a single outage could exhaust it.
✓
Delay the release and focus on improving reliability to rebuild the error budget.
Why this is correct
Conservative approach: wait until more error budget is earned (e.g., through flawless operation) before releasing.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Release the feature but only to a small percentage of users.
Why it's wrong here
Canary releases can reduce risk, but the question implies a full release; even a canary uses error budget if it fails.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that a canary release (Option D) is always safe, but the trap here is that it still consumes error budget and does not solve the underlying reliability deficit when the budget is already critically low.
Detailed technical explanation
How to think about this question
Error budgets are calculated as (1 - SLO) * total time; for a 99.9% SLO over 30 days (43,200 minutes), the budget is 43.2 minutes. After consuming 30 minutes in the first week, only 13.2 minutes remain, which is critically low. In SRE practice, when error budget is nearly exhausted, the team should enter a 'freeze' on new releases and focus on reliability improvements like implementing retry logic with exponential backoff, improving incident response runbooks, or adding load shedding mechanisms to protect the service from cascading failures.
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 PCA question in full detail.
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: Delay the release and focus on improving reliability to rebuild the error budget. — With only 13 minutes of error budget remaining after the first week, proceeding with the release (Option B) risks exhausting the budget entirely from any unforeseen issues, violating the 99.9% SLO. Delaying the release (Option C) allows the team to focus on reliability improvements, such as implementing canary deployments, adding circuit breakers, or enhancing monitoring with tools like Prometheus and Grafana, to rebuild the error budget over the remaining 23 days. This aligns with the principle of using error budgets to balance innovation with reliability, as defined in Google's SRE practices.
What should I do if I get this PCA 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: "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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