The increased usage of IoT, containerization, and multiple clouds not only changed the way IT works but also the way IT Operations, i. e., the monitoring and management of IT assets, works. Monitoring a complex IT environment leads to massive amounts of heterogeneous context data, usually spread across multiple data silos, which needs to be analyzed and acted upon autonomously. However, for a holistic overview of the IT environment, context data needs to be consolidated which leads to several problems. For scalable and automated processes, it is essential to know what context is required for a given monitored resource, where the context data are originating from, and how to access them across the data silos. Therefore, we introduce the Monitoring Resource Model for the holistic management of context data. We show what context is essential for the management of monitored resources and how it can be used for context reasoning. Furthermore, we propose a multi-layered framework for IT Operations with which we present the benefits of the Monitoring Resource Model.