Measurement is the most central concept in any performance-related activity. If you are not measuring you are blind. As important as measuring per se is collecting the right measurements. Which metrics are the right ones depends on what you want to do. However there are some general principles which – when followed – can make your life much easier.

Many people think that measuring application performance means measuring response times. While this is a good starting point it is not the whole story. First of all it is not that straightforward what response times actually mean. Depending on whom you ask you will get different definitions. Week 2 of our Application Performance Almanac, “The many faces of end-user monitoring” , describes different ways to measure response times.

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