Keep appetite for the stats, it costs nothing

" summary

Describes VPP’s shared-memory, optimistic-locking model for producing low-cost, up-to-date packet-processing counters in userspace, and explains how those counters are consumed. Covers two consumption implementations: a FUSE-based userspace filesystem (via go-fuse) that exposes stats like /proc, and a Prometheus exporter used with Calico/VPP to collect pod-interface metrics from Kubernetes nodes.

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