This is actually covered pretty well (imho) in Chapter 32. Many services start out wholly supported by their developers, and are only onboarded to SRE after the

This is actually covered pretty well (imho) in Chapter 32. Many services start out wholly supported by their developers, and are only onboarded to SRE after they reach a certain level of maturity (and/or criticality to the business) Even after SRE takes over operations of a service, developers remain closely involved, and in many cases have their own pager rotation for "something's really broken, SRE has stopped the user-visible bleeding, but we need a code owner to jump in and help solve the root issue."