Each node stores histograms as running totals since it started. A sample didn't say which node wrote it (the node was only in the id's low bits), so a reader couldn't diff totals per node, and the console diffed across nodes: on the three-node production cluster the delivery attempt time read 14.7 s over the last hour against 0.7 s from the nodes' own figures. x:Metric/get now returns nodeId alongside timestamp, both from the id. The telemetry suite checks every sample carries it.