1. A method of operating a correlative monitoring, analysis and control (MAC) system in connection with a production metanetwork having a plurality of interconnected networks including an intranet, an extranet, and a public internet, comprising: obtaining traffic records from tap nodes disposed on respective communication channels within the metanetwork, the traffic records generated from message segments obtained from the communication channels, the traffic records including time information, source/destination information, and message content taken from the message segments, the traffic records being divided into distinct probe traffic records and target traffic records; generating a metanetwork traffic model for the metanetwork, the metanetwork traffic model including: a network topology graph of the metanetwork, the network topology graph created using, as input traffic records, the traffic records obtained from the metanetwork; and a network segment transit-time digraph of the metanetwork, the network-segment transit-time digraph created using the input traffic records and the network topology graph; processing the input traffic records, the network topology graph and the network segment transit-time graph to generate causal traffic-record selections, each including a respective probe traffic-record and one or more respective target traffic-records, the processing including, for each probe traffic-record, selecting causally related target-traffic records for inclusion in a causal-record selection for the probe traffic-record; processing each causal traffic-record selection to generate a corresponding augmented traffic record by augmenting the message content of the probe traffic-record with adidentifying information obtained from the message content of the respective target traffic-records of the causal traffic-record selection, the adidentifying information providing supplemental distinguishing information for the augmented traffic record; and displaying respective renderings of the augmented traffic-records to an analyst user, wherein (a) the probe traffic-records are provided by a first tap node in front of or behind a merchant web server and include a given probe traffic-record with a session identifier of a user session on the merchant web server, (b) the respective target traffic-records of the causal record selection containing the given probe traffic-record are provided by a second tap node tapping traffic to and from another server where the session identifier is associated with a resource identifier of a resource used in the session, and (c) the augmented traffic-record of the causal record selection includes (i) the session identifier from the given probe-traffic record, and (ii) as the adidentifying information, the resource identifier for the user session, wherein the other server includes either (1) a merchant database where the session identifier is associated with an account identifier as the resource identifier for the user session, the account identifier being obtained from the target traffic-records and included as the adidentifying information in the causal record selection, or (2) a payment processor where the session identifier is associated with a purchase-card identifier as the resource identifier for the user session, the purchase-card identifier being obtained from the target traffic-records and included as the adidentifying information in the causal record selection.