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You are responsible for the reliability of a custom-built, distributed file storage service that your company uses internally. This service handles thousands of file uploads and downloads daily. You need to define a service level indicator (SLI) to measure the reliability of your service usage and configure alerts to be notified of potential issues. Which SLI should you use to measure the reliability of the service?
Correct Answer: C
SLIs are quantitative measures of service behavior. For reliability, success rate (successful vs. total requests) is the most fundamental metric. "The most common SLIs are request success rate, availability, and latency." - Google SRE Workbook: Implementing SLIs "Availability SLIs often look like 'the fraction of requests that succeed.'" - Google SRE Book Option C directly maps to this definition and is the most accurate and measurable indicator of overall reliability.