wgengine/magicsock: remove unused metric
We don't increment the metricRecvData anywhere, just the per-protocol
ones.
@@ -4158,7 +4158,6 @@ func (s derpAddrFamSelector) PreferIPv6() bool {
// Data packets (non-disco)
metricSendData = clientmetric.NewCounter("magicsock_send_data")
metricSendDataNetworkDown = clientmetric.NewCounter("magicsock_send_data_network_down")
- metricRecvData = clientmetric.NewCounter("magicsock_recv_data")
metricRecvDataDERP = clientmetric.NewCounter("magicsock_recv_data_derp")
metricRecvDataIPv4 = clientmetric.NewCounter("magicsock_recv_data_ipv4")
metricRecvDataIPv6 = clientmetric.NewCounter("magicsock_recv_data_ipv6")
