SLI
A quantitative metric used to measure the performance or reliability of a service, forming the basis for defining and tracking SLOs and SLAs.
A Service Level Indicator (SLI) is a specific, quantitative metric that reflects the performance, availability, or reliability of a service. SLIs are used to track how well a service meets its objectives (SLOs) and contractual obligations (SLAs).
Examples of SLIs include request latency, error rates, throughput, and uptime percentages. By continuously monitoring SLIs, organizations can detect deviations from targets, trigger alerts, and drive operational improvements.
SLIs are foundational to SRE and cloud operations, enabling data-driven decision-making, proactive incident management, and transparent reporting to stakeholders.