Release notes are maintained in rst format in 
  doc/source/releasenotes/
they can be read online at 
  http://ceilometer.readthedocs.org/en/latest/releasenotes/index.html

Documentation for the project can be found at:
  http://ceilometer.readthedocs.org

The project home is at:
  http://launchpad.net/ceilometer