Gnocchi is a service for managing a set of resources and storing metrics about them, in a scalable and resilient way. Its functionalities are exposed over an HTTP REST API.
There is a more consistent presentation of Gnocchi:
https://julien.danjou.info/blog/2015/openstack-gnocchi-first-release
And online documentation:
http://docs.openstack.org/developer/gnocchi/
Your are invited to file bug reports (if you find bugs) in the bug tracker, available at:
http://bugs.launchpad.net/gnocchi