What is OpenStack?
OpenStack is by far the largest free software IaaS (infrastructure as a service) cloud project. It receives collaboration of developers and cloud computing technologists producing the ubiquitous Free Software cloud computing platform for public and private clouds. The project aims to deliver solutions for all types of clouds by being simple to implement, massively scalable, and feature rich. The technology consists of a series of interrelated projects delivering various components for a cloud infrastructure solution.
Who maintains OpenStack in Debian? How to contribute?
The OpenStack Debian GNU/Linux packages are maintained by a team managed on alioth.debian.org available daily, either through the OpenStack packaging mailing list or via IRC on #debian-openstack on the OFTC network.
Also, the team now maintains a /OpenStack/todo on the packaging work.
You may find documentation on how to use and install OpenStack over here:
The official OpenStack documentation now including Debian specifics on a separated manual.
How Debian users should report bugs?
Bugs shall be reported against the Debian packages the same way as the for other packages in Debian. If you don't know how to do it, you can read this page on the official Debian site.