Implementations of the present disclosure include methods for managing data quality for event data. In some implementations, methods include receiving, at one or more computing devices, a plurality of events, each event comprising event data and being generated by an event source in response to a real-world activity, processing, using the one or more computing devices, the plurality of events using one or more complex event processing (CEP) rules to generate a complex event, in response to generating the complex event, annotating the complex event with quality information corresponding to each of the plurality of events to provide a quality-enriched event, and publishing the quality-enriched event.