In this report we present a model-driven approach to the development of business process monitoring solutions for BPEL processes. The approach allows modeling of process performance metrics in a platform-independent manner and then automatically generating an event-based monitor model for a specific process execution infrastructure. We create a metamodel which enables modeling of different types of process performance metrics. In particular, our approach supports modeling of metrics related to correlated processes. In the deployment phase, we generate a monitor model based on a proprietary event model of a process engine. In addition, we determine which events are needed for the calculation of PPMs, and generate corresponding deployment information for the process engine.