如果能够去掉应用一直处于可用状态这一需求，那么维护和伸缩性将变得更加易于管理。
After you've removed the requirement that applications be always available, maintenance and scalability are much easier to manage.
确定可伸缩性和高可用性需求。
这些非功能需求与服务性能、服务可伸缩性和可跟踪性相关。
These nonfunctional requirements are around service performance, service scalability, and traceability.
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