Fundamentals
Articles in the Fundamentals category.
April 21, 2026 • 2 min read
Fundamentals
What is downtime (and how to measure it)?
Understand what downtime means, the difference between planned and unplanned downtime, and how to measure it in real-world scenarios.
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April 21, 2026 • 3 min read
Fundamentals
What is SLA vs SLO vs SLI?
Understand the difference between SLA, SLO, and SLI, and how they define reliability in modern systems.
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April 21, 2026 • 2 min read
Fundamentals
What is uptime (and how is it calculated?)
Understand what uptime means, how it's calculated, and what 99.9% uptime actually represents in real time.
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