From 8f1d0a149c20564e7998a0ca0d762f98841aae8a Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Sat, 24 Feb 2024 20:51:22 +0100
Subject: [PATCH] node_exporter: Disable ARP netlink collector

It currently fails (logging an error message on every scrape). This
disables the netlink collector, making it fall back to reading ARP
entries from /proc/net/arp.
---
 modules/prometheus/node_exporter.nix | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/modules/prometheus/node_exporter.nix b/modules/prometheus/node_exporter.nix
index 5d4f717..124990b 100644
--- a/modules/prometheus/node_exporter.nix
+++ b/modules/prometheus/node_exporter.nix
@@ -8,7 +8,10 @@
     enable = config.sbruder.wireguard.home.enable;
     listenAddress = config.sbruder.wireguard.home.address;
     enabledCollectors = [ "systemd" ];
-    disabledCollectors = [ "rapl" ];
+    disabledCollectors = [
+      "arp.netlink" # https://github.com/prometheus/node_exporter/issues/2849
+      "rapl"
+    ];
   };
 
   systemd.services.prometheus-node-exporter.after = [ "wireguard-wg-home.service" ];