Reliability testing is crucial for ensuring the stability and resilience of cloud-native distributed systems, as these tests help identify potential failure modes before they impact production. Gremlin offers pre-built reliability tests that simulate various scenarios, such as CPU and memory scaling, redundancy during host and availability zone outages, and resilience against network latency and dependency failures. These tests align with best practices and frameworks like AWS's Well-Architected Framework, which emphasizes operational excellence and performance efficiency. Regular reliability testing not only prevents unexpected downtimes but also ensures that systems can automatically scale and remain resilient during outages. By treating reliability risks similarly to security vulnerabilities, organizations can proactively manage and mitigate potential disruptions. Gremlin's platform facilitates this process by offering a range of test suites, including custom options, to help teams continuously validate and improve their systems' reliability.