“DevOps for Site Reliability Engineering: 7.1 Introduction: What SRE Actually Is 66 7.1.1 Origin 66 7.1.2 SRE, DevOps, and Platform Engineering 67 7.2 Service Levels 67 7.2.1 The Three Terms 67 7.2.2 Writing a Good SLI 68 7.2.3 The Golden Signals 68 7.2.4 Choosing the Target 68 7.3 Error Budgets ” (2026) in NextGen DevOps: Enterprise AI Features & Autonomous Operations. Wissira Press. Available at: https://books.wissira.us/index.php/WIL/catalog/book/160/chapter/1396 (Accessed: 26 October 2026).