Customer satisfaction survey, Net promoter score, and Service level agreement are measures that can be used to specifically measure customer loyalty. Customer satisfaction survey is a method of collecting feedback from customers about their satisfaction with a product, service, or experience. Customer satisfaction survey can help measure customer loyalty by indicating how happy customers are with the company and how likely they are to continue doing business with them. Net promoter score is a metric that measures the willingness of customers to recommend a company's products or services to others. Net promoter score can help measure customer loyalty by indicating how loyal customers are to the company and how likely they are to refer new customers to them. Service level agreement is a contract that defines the level of service that a customer expects from a provider, such as response time, resolution time, availability, or quality. Service level agreement can help measure customer loyalty by indicating how well the company meets the customer's expectations and how satisfied the customer is with the service. Verified References: Service Cloud Consultant Certification Guide
& Tips, Measure Customer Satisfaction, Net Promoter Score Overview, Set Up and Manage Entitlements and Milestones