As distributed systems are becoming increasingly popular, the reliability between services is becoming more important than ever before. Sentinel is a powerful flow control middleware that takes "flow" as the breakthrough point and covers multiple fields including flow control, concurrency limiting, circuit breaking, and adaptive system protection to guarantee the reliability of microservices.

• 2012, Sentinel was born in Alibaba with the main purpose of flow control.
• 2013-2017, Sentinel grew fast and became a basic component for all applications in Alibaba. It was used in more than 4000 applications and covers almost all core e-commerce scenarios.
• 2018.07, Sentinel evolves into an open-source project.
• 2019.06, Sentinel C++ is thriving and widely used in Alibaba Group.
• 2020.02, Sentinel Go released.

• How to use