The Rackspace Metrics version defines the contract and build information for the API.
The contract version denotes the data model and behavior that the API supports. The requested contract version is included in all request URLs. Different contract versions of the API might be available at any given time and are not guaranteed to be compatible with one another.
Example: Request URL (contract version in bold)
This document pertains to contract version 2.0.
The API contract is not locked and might change during the Early Access program.
Rackspace will notify customers in release notes when and if the contract does change.