It's also easier when you have a massive fleet of machines, spread across multiple geographic regions. Combine feature toggles + backwards/forwards compatibilit

It's also easier when you have a massive fleet of machines, spread across multiple geographic regions. Combine feature toggles + backwards/forwards compatibility + decent error reporting, and deployments can become more automated. Start by rolling out to 1% of machines in one region. Let it run for a while. No errors? escalate to more machines, or more regions, etc. Release frequency and propagation speed across the network can be as fast or slow as you are comfortable with.