In one embodiment, a system includes a recording module adapted for recording event history information for one or more events associated with an entity, an evaluating module adapted for evaluating the event history information for each of the one or more events associated with the entity against a symptom rule, wherein the symptom rule defines a validity state of a diagnosis, an issuing module adapted for issuing a subscription to one or more subscribers, wherein the subscription enables the one or more subscribers to receive diagnosis information, and an indicating module adapted for indicating the validity state of the diagnosis to the subscriber, wherein the recording module and the evaluating module are independent such that the issuing module and the event history information are substantially decoupled. Other systems and computer program products are also described, according to various embodiments.