Having developers be on-call is such a popular theme. If developers are responsible for being first responders to outages, software improves
Everyone has a test environment. Some are lucky enough to have production.
Little's law. Queueing theory is important for reliability and performance. Know your mathematics. #devopsdays
Ugly, untestable code in production generating revenue >> finely crafted artisanal code not generating money.
Classic learning: problems get fixed quickly when developers of those systems go on call. #osmc