The underlying advantage of cloud computing is that of shared resources that are supported by the underlying nature of a common infrastructure environment. Therefore, SLAs span the entire cloud and are offered by service providers as a service agreement and not a customer-based agreement. Measuring, monitoring, and reporting on cloud performance is based on the final UX or its ability to consume resources. The disadvantage of cloud computing compared to SLAs is the difficulty of determining the cause of service interruptions due to the complexity of the nature of the environment. The aim is to make the control possibilities transparent for the contracting entity by accurately describing the promised performance characteristics such as the volume of performance, reaction time and speed of processing. An important element in this regard is the level of service, which describes the agreed quality of service and contains information on the range of services (e..B g. time, scope), availability, provider response time, etc. The typical example is server operations that must be operated 24 hours a day, 7 days a week with a failure rate of z.B. a maximum of 0.1% per year and a response time of 30 minutes after the damage is reported by an external service provider.  Since the late 1980s, SLAs have been used by fixed telecommunications operators. Today, SLAs are so prevalent that large organizations have many different SLAs in the company itself. Two different units in an organization write an SLA, one being the customer and the other the service provider.
This approach helps maintain the same quality of service across different units of the organization and across multiple locations in the organization. This internal SLA scripting also makes it possible to compare the quality of service between an internal department and an external service provider.  Service level agreements can contain many service performance metrics with appropriate service level objectives. A common case in IT service management is a call center or services. Among the metrically agreed metrics in these cases is: A Web Service Level Agreement (WSLA) is a standard for monitoring compliance with Web services service level agreements. Authors can specify the performance assigned to a web service application, the desired performance goals, and the actions to take if performance is not achieved. FP7 IRMOS also looked at aspects of translating application-level SLAs into resource-based attributes to bridge the gap between customer expectations and cloud provider resource management mechanisms.   The European Commission presented a summary of the results of different research projects in the field of ASAs (from specifications to control, management and implementation).
 A service level agreement is an agreement between two or more parties, one of which is the customer and the other service providers. . . .