What Is an Uptime SLA?
An uptime SLA is a formal agreement promising that a service will be available at least a stated percentage of the time, such as 99.9 percent monthly. Unlike an internal SLO, it is a customer-facing contract that usually carries remedies like service credits when the target is breached. The percentage translates into a concrete allowance of permitted downtime.
Why it matters
An SLA sets the external reliability expectation and the financial stakes of missing it. It frames how much downtime is tolerable and drives the internal SLOs teams hold themselves to.
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