This deliverable presents different security monitoring, notification and enforcement mechanisms for multi-cloud applications. A state of the art of existing mechanisms and deployments strategies is presented. The security metrics that are targeted in the context of MUSA project are listed. The MMT-based monitoring agents as well as example of enforcement agents are also presented in detail. These agents are integrated in the MUSA security assurance platform presented in deliverable D4.2 Initial MUSA Security Assurance Platform.