prometheus-node-exporter-lua: change network metric type to counter

Signed-off-by: Piotr Machała <pm7gt@933x.net>
(cherry picked from commit 626b197cc1)

utils/prometheus-node-exporter-lua/Makefile

@@ -4,8 +4,8 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=prometheus-node-exporter-lua
-PKG_VERSION:=2018.07.23
-PKG_RELEASE:=3
+PKG_VERSION:=2018.12.30
+PKG_RELEASE:=4
 
 PKG_MAINTAINER:=Etienne CHAMPETIER <champetier.etienne@gmail.com>
 PKG_LICENSE:=Apache-2.0

utils/prometheus-node-exporter-lua/files/usr/lib/lua/prometheus-collectors/netdev.lua

@@ -29,7 +29,7 @@ local function scrape()
     end
   end
   for i, ndss in ipairs(netdevsubstat) do
-    netdev_metric = metric("node_network_" .. ndss, "gauge")
+    netdev_metric = metric("node_network_" .. ndss, "counter")
     for dev, nds_dev in pairs(nds_table) do
       netdev_metric({device=dev}, nds_dev[i+1])
     end