> ## Documentation Index
> Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
> Use this file to discover all available pages before exploring further.

# kotnik

> Articles written by kotnik.

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        <span className="text-xs text-subtle">Tuesday, April 21st 2026</span>
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      <h3 className="blog-card-title group-hover:text-accent transition-colors">Building observability from scratch, three times over</h3>
      <p className="blog-card-desc">A look back at how Platform.sh / Upsun's observability evolved from Nagios on a single box to a unified stack across thousands of VMs, and the migration patterns that made each transition smooth.</p>
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