Domain 4: Analyzing and Optimizing Technical and Business Processes — GCP PCA Practice Question 30

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An SLI must measure the user's perspective. Users care about speed and success, not CPU or database metrics.

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C.The proportion of HTTP requests that return a 200 OK status code within 200 milliseconds.✓ Correct

The proportion of HTTP requests that return a 200 OK status code within 200 milliseconds.

In SRE, a Service Level Indicator (SLI) is a carefully defined quantitative measure of some aspect of the level of service that is provided. For user-facing systems, SLIs typically measure Availability (yield) and Latency. Option C correctly combines both into a measurable proportion (e.g., 99% of requests were successful and fast).

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Choosing CPU utilization (A). High CPU doesn't necessarily mean the user is experiencing an error.

You are defining the Service Level Indicator (SLI) for a user-facing web application. According to Google's Site Reliability Engineering (SRE) practices, which metric is the most appropriate SLI for a synchronous request-response service?

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