Abstract: It is presented a risk tag detector server for detecting risk tags, the risk tags being tags which are likely to be faulty. The risk tag detector server comprises: a tag manager interface configured to obtain a tag list comprising at least two tags to evaluate, and to obtain tag data coupled to each of the tags of the tag list; a tag selector configured to select a candidate tag to evaluate from the tag list; a tag event interface configured to obtain event data of tag usage for the candidate tag; and a fault detector configured to determine the candidate tag to be a risk tag when a first condition is satisfied, the first risk condition comprising a first criterion that the event data indicates an absence of candidate tag usage during a predetermined time period. A corresponding method and computer program are also presented.