1. A method for brokering facilitated publisher collaboration in a publish-subscription (pub/sub) messaging environment, comprising: determining, on a broker system that intermediates between a set of publisher systems and a set of subscriber systems, that a first publisher system and a second publisher system in the set of publisher systems in the pub/sub environment are potential peers based on publisher information; communicating, based on a determination that the first publisher and second publisher system are potential peers, a suggestion from the broker system to the first publisher system that a peer relationship be established with the second publisher system; forwarding an invitation for the peer relationship from the first publisher system to the second publisher system; establishing a peer-to-peer (P2P) communication channel between the first publisher system and the second publisher system; identifying a set of data having commonality to the first publisher system and the second publisher system using the P2P communication channel; caching the identified set of data in a common cache using the P2P communication channel; generating a unique identifier corresponding to the set of data, the set of unique identifiers identifying the set of data as cacheable; communicating the unique identifier to at least one of the first publisher system and the second publisher system; and generating a message to one or more subscriber systems in the set of subscriber systems containing the set of data using the unique identifier.