What Does It Mean to Engineer Reliability?

Engineering reliability can kind of go in a ton of different directions. It's about king your developers and asking them to ask their customers, what does reliability mean? What about your service matters? If it's up and running, what would a user consider to be broken? And then you serve that. So when talking about sara being a team that maintains the reliability of a service, is that one half of a team that also includes the dee es are what makes it different from the dev team? Then i think hat there ware a lot of different organizational models that a company can choose to field to kind of achieve the same ends.