A central node sends a query indicating at least one key performance indicator (KPI) and a first KPI filter criterion to one or more edge nodes causing each edge node to cache subscriber data from each subscriber having a KPI value corresponding to the KPI. The central node receives subscriber data, responsive to the query, and aggregates the subscriber data according to each subscriber and the corresponding KPI value to yield an aggregated initial subscriber dataset and sends a subsequent query to each edge node that (for each edge node) indicates a subscriber from the initial subscriber dataset not returned by the edge node. The central node receives subsequent subscriber, responsive to the subsequent query, and aggregates the subsequent subscriber data with the initial subscriber dataset to yield a final subscriber dataset that indicates a total KPI value for each subscriber.