The software life cycle
After a system has successfully gone through the last phases of software development (including performance testing, tuning, and acceptance testing), it will be deployed in production where its hopefully long and successful life will begin for real.
Upgrades
Over its lifetime, the system will most likely need to be upgraded for one reason or another. Upgrading might involve changes to the hardware, code, and configuration. Before this upgraded system is put into production, it should be as thoroughly tested as it was when it was first released in order to ensure that it will meet old, and any new, requirements. Naturally, this includes performance testing and tuning, when needed.
Metrics
During its life in production, a lot ...
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