Charm series in API URL

[Timothy Youell]

Hello all, 

I’ve been part of a small project with Spicule Ltd recently involving extraction of Charm deployment data from the Juju Charm API. Why is it so that the only way to get the deployment data showing for Charms that are only deployable on one series, is by leaving the series section of the URL blank? 

For instance, to view the deployment data of the apache-drill Charm from spiculecharms, which is only deployable on xenial, the following URL is used:
https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download::apache-drill:spiculecharms:*?by=day&start=2018-04-19&end=2018-06-26&include=promulgated <https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download::apache-drill:spiculecharms:*?by=day&start=2018-04-19&end=2018-06-26&include=promulgated>
Which returns deployment data per day for the Charm: 
“
[
{
"Date": "2018-04-25",
"Count": 2
},
{
"Date": "2018-04-26",
"Count": 2
}, ...
“
Notice the :: where the series should be between the two colons. 

If xenial is placed between the colons, like so,
https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:xenial:apache-drill:spiculecharms:*?by=day&start=2018-04-19&end=2018-06-26&include=promulgated <https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:xenial:apache-drill:spiculecharms:*?by=day&start=2018-04-19&end=2018-06-26&include=promulgated>
no data is returned:
“
[
{
"Count": 0
}
]
“
If the Charm is deployable on more than one series, such as hadoop-plugin from bigdata-charmers, which is deployable on both xenial and trusty, then the addition of the series does show the deployment data: 
https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:xenial:hadoop-plugin:bigdata-charmers:5?by=day&start=2016-04-01&end=2018-06-20&include=promulgated <https://api.jujucharms.com/charmstore/v5/stats/counter/archive-download:xenial:hadoop-plugin:bigdata-charmers:5?by=day&start=2016-04-01&end=2018-06-20&include=promulgated>

Any insight into this would be greatly appreciated.

Thanks,

Tim Youell
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