Web servers nowadays have to cope with unprecedented amounts of workload, due to increasing popularity and complexity; in particular, dynamically generated content becomes the standard, hence the term Web application. Providing enough resources to sustain these workloads is a grand challenge, thus the application's runtime environment is often trusted to third-party hosting providers. In such context, it is desirable to make sure that hosted applications are guaranteed a predictable level of performance, in other words implement Service-Level Agreements (SLAs). This paper presents an approach to Web application SLA, based on profiling and geared at black-box server components, which allows to express SLAs using application-level metrics, such as request rates.
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