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This work contains a short survey of recent results in the literature with a view to opening up new research directions for the problem of honoring SLAs on cloud computing services. This is a new problem that has attracted significant interest recently, due to the urgent need for providers to provide reliable, customized and QoS guaranteed computing dynamic environments for end-users as agreed in contracts on the basis of certain Service Level Agreements (SLAs). Honoring SLAs is a multi-faceted problem that may involve optimal use of the available resources, optimization of the system's performance and availability or maximization of the provider's revenue and it poses a significant challenge for researchers and system administrators due to the volatile, huge and unpredictable Web environments where these computing systems reside.
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