SLO
also: SLA (Service Level Agreement), Service Level Objective
Service Level Objective (SLO) is a target metric that defines the acceptable performance or availability level a system should maintain, such as 99.9% uptime.
SLO (Service Level Objective) is a measurable goal that specifies the minimum acceptable performance, reliability, or availability of a service or system. SLOs are typically expressed as percentages (e.g., 99.95% availability) and are used to set expectations for users and guide operational decisions.
Common SLO metrics include uptime percentage, response time, error rate, and throughput. For example, a web service might have an SLO of 99.9% availability over a month, meaning it can tolerate approximately 43 minutes of downtime.
SLOs are closely related to SLAs (Service Level Agreements), which are contractual commitments with penalties for missing SLOs. System administrators and DevOps teams use SLOs to monitor performance, trigger alerts, and justify infrastructure investments.