The DevOps Handbook

Our call to action is this: no matter what role you play in your organization, start finding people around you who want to change how work is performed.

As Giray Özil tweeted, “Ask a programmer to review ten lines of code, he’ll find ten issues. Ask him to do five hundred lines, and he’ll say it looks good.”

In many organizations, change advisory boards serve an important role in coordinating and governing the delivery process, but their job should not be to manually evaluate every change, nor does ITIL mandate such a practice.

The Other Side of Innovation: Solving the Execution Challenge, Dr. Vijay Govindarajan and Dr. Chris Trimble

We have re-discovered that the secret to smooth and continuous flow is making small, frequent changes that anyone can inspect and easily understand.

Komogorov-Smirnov test, a

“3 standard deviation” rule
(Source: Dr. Toufic Boubez, “Simple math for anomaly detection.”)

“3 standard deviation” rule

Gaussian bell curve

When people ask me for recommendations on what to monitor, I joke that in an ideal world, we would delete all the alerts we currently have in our monitoring system. Then, after each user-visible outage, we’d ask what indicators would have predicted that outage and then add those to our monitoring system, alerting as needed. Repeat. Now we only have alerts that prevent outages, as opposed to being bombarded by alerts after an outage already occurred.”