What Site Reliability Engineering Actually Is, and Why It's a National Infrastructure Discipline

Short summary

SRE is a discipline—not just a role—that treats operational reliability as an engineering problem. Built on four pillars (SLI, SLO, error budgets, and toil reduction), it transforms how organizations align reliability work with development. Google's 2003 formalization continues to define how critical infrastructure is managed.

• •SRE is a discipline grounded in software engineering principles, not a job title or toolkit
• •Four pillars—SLI (user-centric metrics), SLO (reliability targets), error budgets (permissible downtime), and toil reduction—form the foundation
• •Error budgets align incentives between development and operations without requiring separate governance

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