Though every system is different in the services provided, often common SLIs are used. Common SLIs include latency, throughput, availability, and error rate; [2] others include durability (in storage systems), end-to-end latency (for complex data processing systems, especially pipelines), and correctness.[1]
References
12Niall Richard Murphy; Betsy Beyer; Jennifer Petoff; Chris Jones. "Service Level Terminology". Site Reliability Engineering: How Google Runs Production Systems. pp.37–40.