Latest CKAN version supported: CKAN 2.5
To enable:
ckan.tracking_enabled = True
ckan.plugins = datagm ...
It uses the built-in tracking feature, so you'll need to set up a cron job:
@hourly /usr/lib/ckan/datagm/bin/paster --plugin=ckan tracking update -c /etc/ckan/datagm/production.ini && /usr/lib/ckan/datagm/bin/paster --plugin=ckan search-index rebuild -r -c /etc/ckan/datagm/production.ini