Why SLAs, SLOs, and SLIs Matter More Than 'Reliable' on a Landing Page

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Many SaaS companies market themselves as reliable, but few publish verifiable data to back that claim, making the term largely meaningless. Site Reliability Engineering defines three key concepts — SLIs, SLOs, and SLAs — to bring measurable precision to availability commitments. An SLA is not simply a high-sounding uptime percentage; it is a contractual promise tied to a specific measurement model, time period, exclusions, and consequences for missing targets. The gap between 99% and 99.99% availability may seem small, but it shrinks the allowable downtime budget by 100 times and demands significant investment in redundancy, observability, and incident response. Raw uptime figures also fail to capture real user impact, since five minutes of downtime during peak activity can be far more damaging than the same outage at an off-peak hour.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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