Web this article discusses 11 indicators to keep the services offered with your 3pl as high as possible, which in turn will provide cost savings while servicing the customer at the. Logistics service level agreement template. Web service level agreement (sla) is a documented agreement between a service provider and a customer that identifies both the services required and the expected level of service. Web in logistics, a service level agreement is a contract between a business and a logistics partner that outlines the services to be provided and the performance level. It usually includes almost all of the standard points and clauses.