You are defining Service Level Indicators (SLIs) for a user-facing e-commerce website. According to Google's SRE practices, which TWO metrics are the most appropriate SLIs for a request-driven web service? (Select TWO)

Service Level Indicators (SLIs) should measure the service from the perspective of the user. For request-driven services (like a website), the most critical SLIs are Availability (did I get a 200 OK or a 500 Error?) and Latency (did it load in 200ms or 5 seconds?). Internal metrics like CPU or memory are useful for debugging but are poor SLIs.