The core of Apache Eagle (called Eagle in the following) is the highly scalable real-time alert engine, including coordinator, metadata service, and policy processing topology, so on. Around Eagle alert engine, community can integrate more data sources and also can write applications to listen to alerts and respond.
Eagle exposes a few places where community can extend Eagle existing capabilities.
integrate more data source
write your own policy engine beyond CEP engine
write your own alert publisher other than email etc.
write best-practice polices and share
Eagle provide user-friendly UI for new data source onboarding, policy management and insights.