MySQL Metrics that Matter provides an objective summary of the importance of monitoring database performance, particularly MySQL. The article highlights four key areas: Throughput, Execution Time, Concurrency, and Utilization. Throughput measures the number of queries executed by the database, while Execution Time evaluates how long each query takes to complete. Concurrency focuses on the number of transactions happening simultaneously, and Utilization monitors resource usage. By tracking these metrics, developers can identify performance bottlenecks and optimize their database for better performance. The article emphasizes the use of MySQL's built-in variables and the performance_schema DB to gather valuable insights into database behavior.