1. A method, comprising distributing, from a policy distribution server to one or more network intermediary devices communicatively coupled to the policy distribution server, on a subscription basis, policy updates to effect desired behaviors of at least one network intermediary device from the one or more network intermediary devices, wherein the policy updates include instructions for data collection by the at least one network intermediary device, wherein the instructions for data collection include directives for determining usage patterns in a content delivery network, and data collected in accordance with said instructions are used as feedback to tune policy updates for the at least one network intermediary device that supplied the data collected and the tuned policy updates are distributed from the policy distribution server to the at least one network intermediary device.