Site Reliability Engineering

Part II. Principles

This section examines the principles underlying how SRE teams typically work—the patterns, behaviors, and areas of concern that influence the general domain of SRE operations.

The first chapter in this section, and the most important piece to read if you want to attain the widest-angle picture of what exactly SRE does, and how we reason about it, is Chapter 3, Embracing Risk. It looks at SRE through the lens of risk—its assessment, management, and the use of error budgets to provide usefully neutral approaches to service management.

Service level objectives are another foundational conceptual unit for SRE. The industry commonly lumps disparate concepts under the general banner of service level agreements, a tendency that makes it harder to think about these concepts clearly. Chapter 4, Service Level Objectives, attempts to disentangle indicators from objectives from agreements, examines how SRE uses each of these terms, and provides some recommendations on how to find useful metrics for your own applications.

Eliminating toil is one of SRE’s most important tasks, and is the subject of Chapter 5, Eliminating Toil. We define toil as mundane, repetitive operational work providing no enduring value, which scales linearly with service growth.

Whether it is at Google or elsewhere, monitoring is an absolutely essential component of doing the right thing in production. If you can’t monitor a service, you don’t know what’s happening, and if you’re blind to what’s happening, ...