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In the past several years the software development lifecycle has changed significantly with high-speed software releases, shared application services, and platform virtualization. The traditional performance assurance approach of pre-release testing does not address these innovations. To maintain confidence in acceptable performance in production, pre-release testing must be augmented with in-production performance monitoring. Obbie Pet describes three types of monitors—performance, resource, and VM platform—and three critical metrics fundamental to isolating performance problems—response time, transaction rate, and error rate. Obbie reviews techniques to acquire and interpret these metrics, and describes how to develop a continuous performance monitoring process. In conjunction with pre-release testing, this monitoring can be woven into a single integrated process, offering a best bet in assuring performance in today’s development world. Take away this integrated process for consideration in your own shop.