The CoMiFin framework can be considered as a highly dynamic controlled system that evolves over time according to SR interactions and the event processing activities performed within SRs. SR event processing requires the ability to allocate and manage online the resources that are necessary for the processing itself, and for meeting the SR business level objectives. These objectives are usually specified in the SR contracts as service level agreements. Accordingly, it is crucial to continuously monitor the operation of the CoMiFin framework in order to ensure its compliance with the specifications of the expected behavior. This chapter describes an efficient monitoring system that (a) collects vital infrastructure metrics (e.g., CPU/memory utilization) and application data (e.g., the number of processed events) from the set of resources and services used for event processing purposes, and (b) processes those metrics to detect violations of the SR contract. The monitoring architecture is model-driven so that changes in the resources or the system objectives can be automatically mapped to monitoring assets. It is implemented in a plugin-based fashion, which enables the flexible extension of evaluation features to capture the complex behavior of the system. © Springer-Verlag Berlin Heidelberg 2012.