Question

Your SRE team is defining an SLI for a customer-facing payments API served on Cloud Run behind a global HTTPS load balancer. Product wants an availability SLO of 99.9% measured over a rolling 28-day window. Requests are logged with HTTP status codes and latency in Cloud Monitoring. Which SLI definition best represents availability for this service and aligns with SRE best practices?

Accepted Answer

The ratio of successful requests (non-5xx responses) to total valid requests, measured at the load balancer

Answer

The average CPU utilization of the Cloud Run instances staying below 80% during the window

Answer

The number of instances that passed their startup health checks each hour

Answer

The percentage of time the underlying VPC connector reported zero packet drops