Systems, methods, and other embodiments associated with monitoring business transactions are described. In one embodiment, a computer-implemented method comprises tracking calls made from a first component to other components in a distributed application wherein the calls are part of processing a business transaction. Aggregate metrics are collected and instance metrics are collected for each of the calls made and a time spent for processing the calls. The method identifies and selects N calls that consumed the most time based on the time spent for processing each call. The instance metrics for the selected N calls and the aggregate metrics are reported to a monitoring server, while the instance metrics from unselected calls are discarded.