There are no regulations that relate to aggregated network traffic monitoring, otherwise companies like SolarWinds, LogicMonitor, ScienceLogic, DataDog etc. would all be out of business!
Unfortunately, without longer data retention times, to report such data, all MSPs will have to purchase a separate solution, such as the above.
With better data retention times for aggregated data only, the need for such a solution will be reduced.
Author, https://www.nuget.org/packages/Meraki.Api/