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feature/*,net/tstun: add tundev_txq_drops clientmetric on Linux

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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>
This commit is contained in:
Jordan Whited
2026-03-19 15:23:17 -07:00
committed by Jordan Whited
parent bdcf976477
commit 9c36a71a90
8 changed files with 604 additions and 0 deletions
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feature/condregister/maybe_tundevstats.go
+8
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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux && !ts_omit_tundevstats
package condregister
import _ "tailscale.com/feature/tundevstats"