Reports and statistics, especially on material that crosses service boundaries (but even on single-service information, to keep services single-responsibility) are their own logical services, which operate on copies of data received from (often multiple) upstream services. (In many real world cases, you’ll want this functionality in a data warehouse, but there are some cases where some of it may be in something that looks like normal services, whose data that can change other than by push from other services deals with reporting and report-delivery configuration, not the business data on which reporting is done.)
