I was poling around for a good definition of DevOps and found a thoughtful article written by Ernest Mueller called What is DevOps?  Highly recommended reading as it includes lots of insight about the relationship between Agile and DevOps.  FWIW, I feel that the concept of the Definition of “Done” is Scrum’s own original take on the same class of ideas: breaking down silos in an organization to get stuff into the marketplace faster and faster.  I even talked about operationalizing software development back in 2004 and 2005 as a counterpoint to the project management approach which puts everyone in silos and pushes work through phase gates.