grafana: more things

1. Smoothed out power draw
- UPS only reports on 9 watt intervals, so smoothing it out gives more
relative detail on trends
2. Add jellyfin integration
- Good for seeing correlations between statistics and jellyfin streams
3. intel gpu stats
- Provides info on utilization of the gpu

services/monitoring.nix

@@ -38,6 +38,17 @@ let
     '';
   };
 
+  intelGpuCollector = pkgs.writeShellApplication {
+    name = "intel-gpu-collector";
+    runtimeInputs = with pkgs; [
+      python3
+      intel-gpu-tools
+    ];
+    text = ''
+      exec python3 ${./intel-gpu-collector.py}
+    '';
+  };
+
   dashboard = {
     editable = true;
     graphTooltip = 1;
@@ -54,6 +65,21 @@ let
     title = "System Overview";
     uid = "system-overview";
 
+    annotations.list = [
+      {
+        name = "Jellyfin Streams";
+        datasource = {
+          type = "grafana";
+          uid = "-- Grafana --";
+        };
+        enable = true;
+        iconColor = "green";
+        showIn = 0;
+        type = "tags";
+        tags = [ "jellyfin" ];
+      }
+    ];
+
     panels = [
       # -- Row 1: UPS --
       {
@@ -415,6 +441,42 @@ let
           graphMode = "area";
         };
       }
+
+      # -- Row 3: Intel GPU --
+      {
+        id = 8;
+        type = "timeseries";
+        title = "Intel GPU Utilization";
+        gridPos = {
+          h = 8;
+          w = 24;
+          x = 0;
+          y = 16;
+        };
+        datasource = promDs;
+        targets = [
+          {
+            datasource = promDs;
+            expr = "intel_gpu_engine_busy_percent";
+            legendFormat = "{{engine}}";
+            refId = "A";
+          }
+        ];
+        fieldConfig = {
+          defaults = {
+            unit = "percent";
+            min = 0;
+            max = 100;
+            color.mode = "palette-classic";
+            custom = {
+              lineWidth = 2;
+              fillOpacity = 10;
+              spanNulls = true;
+            };
+          };
+          overrides = [ ];
+        };
+      }
     ];
   };
 in
@@ -500,7 +562,6 @@ in
         root_url = "https://${service_configs.grafana.domain}";
       };
 
-      # Caddy handles auth -- disable Grafana login entirely
       "auth.anonymous" = {
         enabled = true;
         org_role = "Admin";
@@ -539,21 +600,17 @@ in
     };
   };
 
-  # Provision dashboard JSON
   environment.etc."grafana-dashboards/system-overview.json" = {
     text = builtins.toJSON dashboard;
     mode = "0444";
   };
 
-  # Caddy reverse proxy with auth
   services.caddy.virtualHosts."${service_configs.grafana.domain}".extraConfig = ''
     import ${config.age.secrets.caddy_auth.path}
     reverse_proxy :${builtins.toString service_configs.ports.private.grafana.port}
   '';
 
-  # -- Jellyfin metrics collector --
-  # Queries the Jellyfin API for active streams and writes a .prom file
-  # for the node_exporter textfile collector.
+  # -- Jellyfin active-stream prometheus textfile collector --
   systemd.services.jellyfin-metrics-collector = {
     description = "Collect Jellyfin metrics for Prometheus";
     after = [ "network.target" ];
@@ -572,7 +629,24 @@ in
     };
   };
 
-  # Ensure textfile collector directory exists (tmpfs root -- recreated on boot)
+  # -- Intel GPU textfile collector --
+  systemd.services.intel-gpu-collector = {
+    description = "Collect Intel GPU metrics for Prometheus";
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = lib.getExe intelGpuCollector;
+    };
+    environment.TEXTFILE = "${textfileDir}/intel-gpu.prom";
+  };
+
+  systemd.timers.intel-gpu-collector = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "*:*:0/30";
+      RandomizedDelaySec = "10s";
+    };
+  };
+
   systemd.tmpfiles.rules = [
     "d ${textfileDir} 0755 root root -"
   ];