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Explain the most critical sysctl parameters for production Linux servers, covering vm.swappiness, net.core.somaxconn, fs.file-max, and TCP tuning across a 10,000 RPS web tier.
## Problem
You are joining a team that operates a web tier of 500 Linux servers, each handling approximately 10,000 requests per second. The hosts are running with default kernel parameters, and the team has been experiencing intermittent connection drops under peak load, high tail latency during memory pressure, and occasional "too many open files" errors. Your task is to explain the most important sysctl parameters for production tuning and propose a systematic approach to rolling out changes safely.
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