speciify statistics requirements

[tauli]

I have little confidence in the statistics that are currently collected (see e.g.

services-inoeg/servers/app_provider_publish_appointments.go

Line 69 in 7fae6ce

// to do: fix statistics generation

). If statistics are still a requirement, please specify the statistics that need to be collected and we'll check and fix the current implementation.

[benbender]

If this is a requirement, I would like to have a meaningful api for it in vanellus as well. It's missing completely atm because of the unclear status of the feature