SLO.

also: SLOs · service level objective · service level objectives

Service level objective: the internal target for an SLI over a window, such as 99.9% of requests succeeding over 30 days.

the two-minute refresher

Set it from user expectations, history and business cost, not at today's performance.
Stricter than the SLA, so you notice trouble before customers can claim credits.
100% is the wrong target: it freezes change and costs a fortune.
The gap between the SLO and 100% is the error budget.

also: SLOs · service level objective · service level objectives

Service level objective: the internal target for an SLI over a window, such as 99.9% of requests succeeding over 30 days.

Set it from user expectations, history and business cost, not at today's performance.
Stricter than the SLA, so you notice trouble before customers can claim credits.
100% is the wrong target: it freezes change and costs a fortune.
The gap between the SLO and 100% is the error budget.