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kube-proxy expose the metric network_programming_duration_seconds, that is defined as the time it takes to program the network since a a service or pod has changed. It uses an annotation on the endpoints /endpointslices to calculate when the endpoint was created, however, on restarts, kube-proxy process all the endpoints again, no matter when those were generated, polluting the metrics. To be safe, kube-proxy will estimate the latency only for those endpoints that were generated after it started.