Three related terms describe reliability. A service level indicator (SLI) is a measurement, such as the percentage of requests that succeed or the percentage served in under 300 ms. A service level objective (SLO) is the internal target for that indicator, such as 99.9 percent of requests succeeding over 30 days. A service level agreement (SLA) is a contract with customers that states a level of service and what happens if it is missed, usually service credits (a partial refund), not compensation for your business losses.
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