This deliverable presents different security monitoring, notification and enforcement mechanisms for multi-cloud applications developed in MUSA. The document builds on top of the previous deliverable D4.1 Initial security assurance mechanisms and tools and completes it with progress made till the end of the MUSA project. 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 and the enforcement agents developed in MUSA are also presented in detail. These agents are integrated in the MUSA Security Assurance Platform presented in the deliverable D4.4 Final MUSA Security Assurance Platform and User manual.