The 2021 SRE Report examines how organizations can scale digital services without increasing cost, risk, and complexity. It positions site reliability engineering as a key discipline for managing growth by applying software engineering principles to operations and infrastructure challenges. SRE focuses on designing ultra‑scalable, highly reliable distributed systems and complements DevOps by defining how reliability is measured and achieved in production environments. By combining engineering practices with operational accountability, SRE helps teams maintain performance, reduce failure impacts, and deliver dependable services as systems and user demands scale rapidly.

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