This guide explains the concept of a Digital Immune System, a set of practices and technologies that protect applications and services, reduce failures, and improve customer experience. It defines DIS as combining observability, AI-augmented testing, chaos engineering, autoremediation, site reliability engineering, and software supply chain security. The three phases are: creating a holistic vision of systems health, fortifying defenses with these practices, and extending manual and automated testing beyond development. Done well, DIS quietly minimizes risk, downtime, and business disruption.

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