A decade ago, Google released Site Reliability Engineering: How Google Runs Production Systems with O'Reilly Media. What began as a collection of our practices for managing large-scale infrastructure became a bestselling book, and inspired many organizations to adopt the reliability practices it outlined: applying software engineering to operations to build systems that are scalable, reliable, and sustainable.

Over the past ten years, computing landscapes have undergone profound shifts. AI, microservices, multi-cloud deployments, serverless paradigms, and platform engineering have all reshaped how we build and operate software. To mark the 10th anniversary of the book's release, we are excited to announce the completely rewritten second edition of the Google SRE book, reflecting a decade of lessons learned both inside Google and across the broader industry, to offer fresh guidance tailored for today's operational challenges.

When we published the first edition, many organizations were focused on early cloud migrations and just starting to transition from monolithic architectures. Today, with organizations delivering software at a high velocity and at global scale, the challenge is no longer adopting cloud infrastructure, but maintaining high reliability in the face of the immense complexity.

Modern production environments operate under constant change. System boundaries are more complex, dependencies are deep, and failure modes are more complex and damaging than ever before. The explosion of resource-intensive workloads like generative AI has changed the economics and operational requirements of infrastructure management.

Writing this second edition required us to take a step back and evaluate what it takes to successfully implement SRE today.

The second edition takes a deep dive into how foundational site reliability engineering practices have matured over the last ten years, shifting from manual, task-specific work toward automated, platform-wide capabilities. Consider, for example:

SLOs and error budgets: In 2016, teams relied on basic availability metrics and manual error budget policies. Today, practices have matured into user-centric, multi-tiered SLOs with dynamic burn-rate alerting and automated policy enforcement.

Monitoring and observability: Early setups centered on static dashboards, basic logs, and manual alert triage. Modern observability leverages OpenTelemetry, distributed tracing, and automated anomaly correlation to find root causes quickly.