Adding more statistics
From https://indico.cern.ch/event/1354671/
Statistics that could reflect real usage growth (probably a mix of legoservices and ES audit data):
- Channels per department
- Active users per department
- top channels with most organic users (self-subscription) and total of self subscriptions per channel
- average amount of preferences per user
- average amount of muted channels per user
- average amount of notifications per channel
- average amount of end users reached per notification (need to use audit info)
- average amount of device reached per notification (need to use audit info)
- 5 latest channels created (just a fun fact)