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net/udprelay: expose peer relay metrics (#18218)

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Adding both user and client metrics for peer relay forwarded bytes and
packets, and the total endpoints gauge.

User metrics:
tailscaled_peer_relay_forwarded_packets_total{transport_in, transport_out}
tailscaled_peer_relay_forwarded_bytes_total{transport_in, transport_out}
tailscaled_peer_relay_endpoints_total{}

Where the transport labels can be of "udp4" or "udp6".

Client metrics:
udprelay_forwarded_(packets|bytes)_udp(4|6)_udp(4|6)
udprelay_endpoints

RELNOTE: Expose tailscaled metrics for peer relay.

Updates tailscale/corp#30820

Change-Id: I1a905d15bdc5ee84e28017e0b93210e2d9660259

Signed-off-by: Alex Valiushko <alexvaliushko@tailscale.com>
This commit is contained in:
Alex Valiushko
2025-12-18 16:12:50 -08:00
committed by GitHub
parent bb3529fcd4
commit c40f352103
5 changed files with 269 additions and 12 deletions
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feature/relayserver/relayserver.go
+1 -1
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@@ -70,7 +70,7 @@ func servePeerRelayDebugSessions(h *localapi.Handler, w http.ResponseWriter, r *
func newExtension(logf logger.Logf, sb ipnext.SafeBackend) (ipnext.Extension, error) {
e := &extension{
newServerFn: func(logf logger.Logf, port uint16, onlyStaticAddrPorts bool) (relayServer, error) {
return udprelay.NewServer(logf, port, onlyStaticAddrPorts)
return udprelay.NewServer(logf, port, onlyStaticAddrPorts, sb.Sys().UserMetricsRegistry())
},
logf: logger.WithPrefix(logf, featureName+": "),
}