Topical Takes

Short, opinionated posts on eBPF, Linux internals, and the tools we all run in production.

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Top 5 Kernel Metrics Your APM Agent Misses in 2026: Ranked by How Often They End the Investigation

Five questions Datadog, Pixie, Coroot and node_exporter structurally cannot answer, ranked: off-CPU time, TCP retransmit attribution, per-disk latency histograms, runqueue delay, and the gap between what your app asked for and what reached the device. Each with the tool that gets it and what it costs to run.

off-cputcp-retransmitsrunqlatbiolatencyeBPFobservabilitylinuxyeet
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