The ceilometer team has had a few requests for help with older versions of ceilometer or running the grizzly version of ceilometer with older versions of other OpenStack components lately. We appreciate the level of interest in the project but, as much as we would like to, unfortunately we are not always able to help everyone with these "mixed" configurations. During the early phases of our development we tried to maintain compatibility with folsom, even well into the grizzly development cycle. We are no longer doing that, however, and so to make clear what support we can offer, the ceilometer team has put together the statement below. It has been added to our documentation, and we are posting here to make sure everyone has a chance to see it.
Regards, Doug The ceilometer team has limited capacity to provide support for older versions of the project. Because the project graduated from incubation around the time of the grizzly release, that is the first version for which we will provide regular ongoing support following the standard deprecation cycle for OpenStack . The grizzly version of ceilometer cannot be installed on the same server with earlier versions of OpenStack because of conflicting package requirements, but is API compatible with the folsom release if installed separately.  https://wiki.openstack.org/wiki/StableBranch
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