Lost node atributes. Chef version: 0.9.8

Hi, everyone!
I’m using “chief” for install some packages and deploy user data on rackspace cloud servers. After node registration i can use node attributes “cloud”, or “rackspace” for node ip addresses parsing. I didn’t update chef-software on server and clients, but now when i’m trying to register or re-register node i couldn’t find these attributes. Could you please help to understand how does chief determine these attributes like “cloud” or “rackspace” and why they disappeared?
Chief server and client version are 0.9.8. RHEL 5.5 (final). Ohai - 0.5.6 version.