The practice of DevOps is when development, operations, and quality-assurance testing teams all collaborate seamlessly. Although DevOps is more of a cultural consideration, there is still plenty of tooling that can help with automation. We have covered much of this previously and the only missing pieces left now are to provision and configure infrastructure, then monitor it while in use.
When using automation and techniques such as feature switching, it is essential to have a good view of your environments so that you know the utilization of all the hardware. Good tooling is important when monitoring, and you want to easily be able to see the vital statistics of every server. This will consist of at least the CPU, memory and disk space consumption, and you will want alarms set up to alert you if any of these metrics stray outside of their allowed bands.