You need to define Service Level Objectives (SLOs) for a high-traffic multi-region web application. Customers expect the application to always be available and have fast response times. Customers are currently happy with the application performance and availability. Based on current measurement, you observe that the 90 percentile of latency is 120ms and the 95 percentile of latency is 275ms over a 28-day window. What latency SLO would you recommend to the team to publish?
A. 90th percentile 100ms, 95th percentile 250ms
B. 90th percentile 120ms, 95th percentile 275ms
C. 90th percentile 150ms, 95th percentile 300ms
D. 90th percentile 250ms, 95th percentile 400ms
Disclaimer
This is a practice question. There is no guarantee of coming this question in the certification exam.
Answer
C
Explanation
Key points are underlined.
You need to define Service Level Objectives (SLOs) for a high-traffic multi-region web application. Customers expect the application to always be available and have fast response times. Customers are currently happy with the application performance and availability. Based on current measurement, you observe that the 90 percentile of latency is 120ms and the 95 percentile of latency is 275ms over a 28-day window. What latency SLO would you recommend to the team to publish?
A. 90 percentile 100ms, 95 percentile 250ms
B. 90 percentile 120ms, 95 percentile 275ms
(Misleading, as it’s mentioned in the question that “Customers are currently happy with the application performance and availability.”)
C. 90 percentile 150ms, 95 percentile 300ms
(https://sre.google/sre-book/service-level-objectives/
“Don’t pick a target based on current performance.” Picking an SLO based upon current performance can commit you to unnecessarily strict SLOs. Select slightly lower SLO.)
D. 90 percentile 250ms, 95 percentile 400ms