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You are on a locked-down host with no agents installed. Which /proc files answer your first troubleshooting questions?

Everything top, htop and your APM agent display is derived from procfs anyway. Knowing the raw files turns any bare SSH session into a monitoring console.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Everything top, htop and your APM agent display is derived from procfs anyway. Knowing the raw files turns any bare SSH session into a monitoring console.

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