Add UPC temperature sensor monitoring

These sensors are part of their air quality measurements, which just
happen to be very close to our server room.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/hut/monitoring.nix

@@ -4,6 +4,7 @@
   imports = [
     ../module/slurm-exporter.nix
     ../module/meteocat-exporter.nix
+    ../module/upc-qaire-exporter.nix
     ./gpfs-probe.nix
     ./nix-daemon-exporter.nix
   ];
@@ -112,6 +113,7 @@
             "127.0.0.1:9966" # GPFS custom exporter
             "127.0.0.1:9999" # Nix-daemon custom exporter
             "127.0.0.1:9929" # Meteocat custom exporter
+            "127.0.0.1:9928" # UPC Qaire custom exporter
             "127.0.0.1:${toString config.services.prometheus.exporters.blackbox.port}"
           ];
         }];

m/module/upc-qaire-exporter.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  systemd.services."prometheus-upc-qaire-exporter" = {
+    wantedBy = [ "multi-user.target" ];
+    after = [ "network.target" ];
+    serviceConfig = {
+      Restart = mkDefault "always";
+      PrivateTmp = mkDefault true;
+      WorkingDirectory = mkDefault "/tmp";
+      DynamicUser = mkDefault true;
+      ExecStart = "${pkgs.upc-qaire-exporter}/bin/upc-qaire-exporter";
+    };
+  };
+}