1. A node for use in a telecommunications network, the node comprising: a network interface circuit; and a processing circuit operatively connected to the network interface circuit, and configured to: receive, via the network interface circuit, a data packet including event data wherein: the event data comprises a summary that includes meta-information; the meta-information comprises information about a data value of at least one item of information associated with one or more events that have occurred at another node in the telecommunications network; and a data size of the summary is smaller than a total data size of all data values associated with the meta-information; and respond to receiving the data packet, wherein to respond to receiving the data packet, the processing circuit is further configured to: interrogate the summary to obtain the meta-information, wherein the interrogation is at least in part, using a binary sequence to address a content-addressable memory in which respective predetermined values are stored; determine whether one or more predetermined interrogation results are obtained from interrogating the summary; and update a counter if each of the one or more predetermined interrogation results are obtained from interrogating the summary.