1. A method comprising: receiving, on a first network, a metric message from a network entity; based at least on a metric identified within data of the metric message and a configuration including data identifying metric messages of interest, determining whether the metric message is of interest; and when the metric message is a metric message of interest, storing the metric message in local storage; according to a schedule, included in the configuration, of when metric messages are to be forwarded to a network and system management system: retrieving metric messages stored in the local storage including the metric message; aggregating the retrieved metric messages to form a metric message payload; forwarding the metric message payload to the network and system management system on a second network; and after successfully forwarding the metric message payload to the network and system management system, deleting from the local storage each metric message aggregated into the metric message payload.