Observability
Articles tagged Observability — notes and deep-dives grouped under this topic.
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Blameless postmortem template: what the agent fills in, what only a human can
A model now writes the first postmortem draft from the timeline and the chat. What is left for people are the fields telemetry does not hold.
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DORA metrics and the SPACE framework: measurement that doesn't break teams
How many metrics does DORA have — four or five? The answer changed in 2025, along with the Elite–Low levels and the name of the organisation itself.
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Argo Rollouts: canary and blue-green with metric-driven auto-rollback
A standard RollingUpdate declares success once pods pass the readiness probe. Argo Rollouts turns the release into a testable hypothesis: stepped canary traffic, blue-green with preview, PromQL-driven AnalysisTemplates and SLO burn rate as an automatic rollback.
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Observability 2.0: eBPF, OpenTelemetry, and AI that finds the root cause
Instrumentation moved into the kernel, telemetry into the OTel standard, root cause analysis toward the machine. Three shifts and the order in which they pay off.
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OOMKilled forensics: from pmap to cgroups memory.stat
Exit code 137 leaves no stack trace and no final log line, while the dashboard swears there was plenty of memory. The tools that answer «where did the memory go» — while the pod is still alive.
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Four golden signals: what they actually catch and why the stack is VictoriaMetrics + Loki
What each of the four signals really catches, and three traps where «we have monitoring» turns out to be green checkmarks above a broken service.
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Error Budget as a Stop Button: SLOs Without Panic
Error budget turns reliability into a resource you can spend — and multi-burn-rate alerts turn it into a page that's actually worth waking up for.
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A Kubernetes Debugging Agent: Query Templates or Scripts?
Zinchenko hands the LLM MetricsQL templates; my VM skill feeds the agent a finished aggregate. I dissect the flexibility-versus-reproducibility axis and why read-only by blacklist is weaker than an allowlist.