The only example for stats/counter in docs/api.md does not work.
stats/counter/download/archive-download:*?by=week&list=1&start=2014-03-01
results in {"Message":"invalid key","Code":"not found"}
some example urls which work: https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:*?&list=1&start=2016-01-01&stop=2016-03-31
e.g. trusty downloads for Q1 2016: https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:trusty:*?&list=1&start=2016-01-01&stop=2016-03-31
same thing broken down with weekly numbers: https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:trusty:*?&list=1&by=week&start=2016-01-01&stop=2016-03-31
This will probably also need changing with the new faster-stats branch changes that are coming.