This InetAddress holds the address of the receiver station to which a specific bulk-stats policy's data was last attempted to be transferred, returning a zero-length string if unknown or if no transfer has occurred. Because it is indexed per policy, it lets an admin verify that each configured export job is targeting the correct collector. For example, a value of 172.16.5.20 for a policy named "dailyPerf" confirms that policy is sending to the intended stats server.