The correct answer is Service Level Indicator.

Service Level Indicator is the established term for a measurable metric that reflects a specific aspect of a service's performance or reliability. Engineers use SLIs to quantify things like latency, availability, throughput, and error rates so that SLOs and SLAs can be evaluated against concrete data.

Cloud Monitoring is incorrect because it is the name of a monitoring product and not the expansion of the SLI acronym.

Software License Integration is incorrect because it refers to licensing concerns and not to service performance metrics.

Server Latency Index is incorrect because it suggests a single latency-focused index while SLI is a general term for any service level metric and not a specific latency index.

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