Problem
升级了两次，发现之前级别的credit没用完，不见了。现在直接消耗pro的credit.如果是这样可以提前提醒，我就不直接升级了。云服务器升级是累加时长，这个是重新开始！请问这是什么原因！
Solution
How should it work?
Use Case
When would you use this?
Priority
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High - Blocking issue -
Medium - Important improvement -
Low - Nice to have
Additional Info
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