Gnocchi is a multi-tenant timeseries, metrics and resources database. It provides an HTTP REST interface to create and manipulate those data. It is designed to store metrics at a very large scale while providing access to metrics and resources information to operators and users.
Gnocchi is part of the OpenStack project. While Gnocchi has support for OpenStack, it is fully able to work stand-alone.
The Gnocchi project was started in 2014 as a spin-off of the OpenStack Ceilometer project to address the performance issues that Ceilometer encountered while using standard databases as a storage backends for metrics. More information are available on Julien’s blog post on Gnocchi.