A Service Level Objective (SLO) is the internal target a team sets for a service’s reliability — for example, 99.95% availability over a rolling 30 days. It is usually stricter than the customer-facing SLA so the team has room to react before the contract is breached.
An SLO is measured against an SLI and paired with an error budget — the amount of unreliability the objective permits.
See how an SLO converts to a budget with the error budget calculator.
