SLA, SLO, and SLI: Understanding the Foundations of Service Reliability
Last week, I ordered a pizza on a food delivery app. And they promised the delivery in 30 minutes. Similarly, all digital services: Apps, websites, cloud platforms, etc, make promises about speed, uptime, and reliability. The difference is how they track and measure those promises. That’s where SLA, SLO, and SLI come in. These three metrics define what “reliable” actually means. They turn a vague claim like “99.9% uptime” into something you can measure, track, and act on.