The Four Golden Signals, and the Two Everyone Forgets
Latency, traffic, errors and saturation are the canonical four. The pair that actually saves you at 3am are the ones about saturation and time.
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Cloud platform practice: compute, cost, identity and the services around them.
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Worth your coffee break
Three pieces we keep coming back to.
cgroups From First Principles: Why Your Container Has No Idea How Big It Is
Containers are not virtual machines. They are a set of kernel bookkeeping rules, and most "container memory" bugs are really cgroup surprises.
Your Base Image Is a Supply Chain Decision, Not a Convenience
Every FROM line is a dependency you never version-pin and rarely scan. A practical model for choosing and maintaining base images.
Spot Instances Are Cheap Until the Wrong Job Lands on One
A 70% discount with a two-minute eviction notice is a great deal for some workloads and a terrible one for others. How to tell which is whic…
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Observability on a Budget: What to Keep When You Cannot Keep Everything
Telemetry bills grow faster than traffic. A pragmatic ordering of what to sample, what to aggregate and what to throw away first.
A Runbook Is Not a Document, and Other Confusions
Most "runbooks" are architecture descriptions written after the fact. A runbook is an executable path from symptom to mitigation, and it has…