Your SRE team is defining Service Level Indicators (SLIs) for a user-facing web application. Which metric is the most appropriate SLI to measure the user experience?

Answer options:

The average CPU utilization of the Compute Engine instances.

The total number of lines of code deployed per week.

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

The amount of free memory available on the database server.

How to approach this question

Choose the metric that directly reflects the customer's experience.

Full Answer

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

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

Service Level Indicators (SLIs) should be user-centric. Users do not see CPU or memory metrics; they see latency and error rates. Measuring the percentage of successful, fast HTTP requests is the standard way to quantify user experience in SRE.

Common mistakes

Choosing infrastructure metrics like CPU (A) or Memory (D).

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