Monitoring of contractual Service Level Agreements (SLAs) between providers of services over the Internet and consumers is concerned with the collection of statistical metrics about the performance of a service to evaluate whether a provider complies with the level of Quality of the Service (QoS) that the consumer expects. The aim of this paper is to bring to the system designer's attention the fundamental issues that monitoring of contractual SLAs involves SLA specification, separation of the computation and communication infrastructure of the provider, service points of presence, metric collection approaches, measurement service and evaluation and violation detection service.
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