I would agree with previous request.
Application Version
It helps during deployment to reduce down time and if we can also access to different version of code through which QA work can be completed would be great. This may give great flexibility
Configuration Version
Trouble shooting & Diagnosing a problem
Improve the logging and add some standard ways to capture runtime snapshot which can be used for later analysis. Walking through some common problem scenarios and improving the mean time to repair will be very useful feature.
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