From 9963fd814e447118efb1786284be4c1d74927820 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kj@orbekk.com>
Date: Sat, 13 Mar 2021 15:21:14 -0500
Subject: Valheim server monitoring

---
 modules/valheim.nix | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/modules/valheim.nix b/modules/valheim.nix
index a151075..f915276 100644
--- a/modules/valheim.nix
+++ b/modules/valheim.nix
@@ -48,5 +48,22 @@ in
         steam-run ./valheim_server.x86_64 -name "doomsday" -port 3400 -world "doomsday" -password "$(cat ${statePath}/password.txt)" -savedir ${statePath} -nographics -batchmode
       '';
     };
+
+    systemd.services.valheim-server-prober = {
+      description = "Collect metrics for valheim-server";
+      startAt = "*:0/5";
+      path = with pkgs; [ moreutils systemd gnugrep coreutils ];
+      script = ''
+        systemctl show valheim-server | \
+        grep -E 'IPIngress|IpEgress|CPUUsage' | \
+        tr '=' ' ' | {
+          while read k v; do
+            echo "# TYPE $k counter"
+            echo "systemd_$k{unit='valheim-server.service'} $v";
+          done
+        } | \
+        sponge ${config.orbekk.monitoring-server.textFileDir}/valheim_server.prom
+      '';
+    };
   };
 }
-- 
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