SLO (Service Level Objective)

A service level objective (SLO) is a measurable goal for a service's performance over a set period. SLOs are part of a service level agreement (SLA), a formal customer-service provider contract. They set customer expectations and help align the goals of both parties.

Here are some examples of SLOs:

Availability

A web application might have an SLO of 99.9% availability over time.

Response time

A help desk might have an SLO of responding to 90% of requests in less than three minutes.

SLOs are measured using service level indicators (SLIs), quantitative metrics of a service's performance. SLOs should be realistic and achievable while reflecting the desired service quality level. They should also be regularly monitored and reviewed to identify areas for improvement.