ExpertMedium1 markMultiple Choice
GCP PCA · Question 30 · Domain 4: Analyzing and Optimizing Technical and Business Processes
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?
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?
Answer options:
A.
The average CPU utilization of the web servers over a 5-minute window.
B.
The total number of database queries executed per second.
C.
The proportion of HTTP requests that return a 200 OK status code within 200 milliseconds.
D.
The amount of time it takes to deploy a new version of the application.
How to approach this question
An SLI must measure the user's perspective. Users care about speed and success, not CPU or database metrics.
Full Answer
C.The proportion of HTTP requests that return a 200 OK status code within 200 milliseconds.✓ Correct
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).
Common mistakes
Choosing CPU utilization (A). High CPU doesn't necessarily mean the user is experiencing an error.
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