Trends, not instants
A number on its own says nothing: keep the history with sysstat, and read a slope where you only saw a value.
22 minutesTechnical content last reviewed on 17 Sept 2026
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What this lesson builds
- Reading system state without over-reading it
- Designing a check that can fail and an alert somebody acts on
End of the course
DNS: pointing a domain at your server
Understand how a name resolves, publish the right records, and diagnose with dig instead of waiting.
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