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By polling RTM_GETSTATS via netlink. RTM_GETSTATS is a relatively efficient and targeted (single device) polling method available since Linux v4.7. The tundevstats "feature" can be extended to other platforms in the future, and it's trivial to add new rtnl_link_stats64 counters on Linux. Updates tailscale/corp#38181 Signed-off-by: Jordan Whited <jordan@tailscale.com>