Application-Level Metrics
Applications require instrumentation to make their behavior observable, and, as appropriate, controllable. Client-side collectors operating in passive or active modes provide some of the instrumentation because they measure the user experience from that location. Note that client-side collectors are usually not a part of the application instrumentation itself; they measure the application behavior for a specific virtual (synthetic) transaction.
Table 8-1 shows examples of application instrumentation for a web sales application. The instrumentation can be further divided into internal and external measurements:
The internal measurements give insight into the behavior of the systems within the direct control of the IT ...
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