Gremlin's reliability score is a tool designed to quantitatively assess the reliability of services within an organization by assigning a score between 0 and 100 based on various tests. The score is derived from the performance of services across different categories such as scalability, redundancy, and dependencies, with each category contributing equally unless customized. These tests, which include both automated Detected Risks and user-run reliability tests, evaluate a service's ability to withstand failures and maintain availability. The reliability score not only reflects how well a service can endure real-world disruptions but also tracks improvements over time, helping teams prioritize and enhance their reliability efforts. By integrating this metric into CI/CD pipelines, organizations can prevent unreliable code from being deployed, ensuring that only resilient services reach production. Custom Test Suites allow teams to tailor the testing process to specific needs, making the score an effective measure of how well teams meet their reliability standards.