TL;DR: The history of DevOps runs two decades behind its own word: the ideas date to the late 1980s, Google ran SRE from 2003, and Patrick Debois gave the movement its name at DevOpsDays in Ghent in 2009.

Winston Royce’s 1970 paper drew the sequential model as a warning, called late testing “risky and invite failure,” and proposed five extra steps; the industry kept the diagram and dropped the steps.

Seventeen developers published the Agile Manifesto at the Lodge at Snowbird, Utah, in February 2001, with Scrum already six years old; feedback moved inside the project while the road to production stayed as it was.

Google founded Site Reliability Engineering in 2003 with seven production engineers under Ben Treynor Sloss, and Netflix followed with Chaos Monkey in 2011, on either side of the 2009 coinage.

Continuous Delivery (2010), The Phoenix Project (2013), and The DevOps Handbook (2016) made the movement teachable; DORA’s 2016 report gave it four measurable metrics.

Deploying is not releasing: feature…