Translation of SLAs into Monitoring Specifications

The general architecture of the SLA@SOI framework supports the integration of different types of generic or special-purpose monitoring engines. While internally these engines may realise different monitoring approaches (or reasoning mechanisms), externally they support the same common interface. This interface enables the reasoning engines to receive the SLA guarantee terms that need to be monitored and to report monitoring results to the SLA@SOI framework. However, due to differences in the languages that the monitoring engines use to express operational monitoring specifications, the monitoring of SLAs expressed in the SLA specification language of SLA@SOI requires the translation of these SLAs into operational monitoring specifications. This chapter describes the translation scheme developed for the monitoring engine EVEREST, which has been used in the SLA@SOI framework for monitoring SLAs at the software service layer.