Live monitoring and feedback
It's 10pm. Do you know where your code is?

Your software is in production, but how is it doing? You want have insight into the runtime health of your system.

This includes easy access to runtime statistics such as feature usage, transaction throughput and error situations to ensure the service level. In addition, access to environment health like disk and memory usage, cpu load

Bonus points if your system can alert you before an error occurs.