Envoy is a high-performance C++ distributed proxy designed for microservices and service-oriented architecture, providing a scalable communication bus and "universal data plane" for large-scale service meshes. It operates alongside applications to abstract network complexities and centralizes concerns like observability and security. Envoy supports a static configuration model and gRPC/protobuf APIs, enhancing manageability with features like rate limiting and API observability. API observability is evolving from traditional monitoring, enabling businesses to address complex challenges by answering unknown unknowns. Moesif offers a plugin for Envoy that facilitates API observability by capturing API interactions for analytics and reporting, empowering engineering teams to optimize performance, enhance security, and make data-driven decisions. It provides insights into user behavior and helps maintain API efficiency and reliability. Moesif's integration allows for advanced analytics, including real-time monitoring and user journey insights, without adding latency, making it a valuable tool for API management and optimization.