Which of the following is an example of a performance metric?

Revenue generated from memberships is a clear example of a performance metric because it provides quantitative data that can measure the financial success and effectiveness of a business or organizational strategy. Performance metrics are specific criteria used to evaluate the performance of an organization, department, or individual, typically focusing on quantifiable results. In this case, the revenue directly reflects how well the organization is performing in attracting and retaining its members, which is a critical aspect of a golf facility's operational success.

The other options, while valuable for gauging certain aspects of an organization, do not directly measure performance in the same way. Employee satisfaction surveys and customer feedback provide qualitative insights but do not quantify financial performance. Employee training hours indicate investment in staff development but do not directly reflect the operational outcomes of those hours in terms of income or efficiency. Therefore, revenue stands out as the most clear and direct performance metric among the choices provided.