feat(grafana): Use the victoriametrics metrics plugin

configuration/services/metrics/grafana.nix

@@ -1,4 +1,4 @@
-{ config, ... }:
+{ pkgs, config, ... }:
 let
   domain = "metrics.${config.services.nginx.domain}";
 in
@@ -28,6 +28,10 @@ in
       };
     };
 
+    declarativePlugins = [
+      pkgs.grafanaPlugins.victoriametrics-metrics-datasource
+    ];
+
     provision = {
       enable = true;
 
@@ -35,7 +39,9 @@ in
         {
           name = "Victoriametrics - tlater.net";
           url = "http://localhost:8428";
-          type = "prometheus";
+          type = "victoriametrics-metrics-datasource";
+          access = "proxy";
+          isDefault = true;
         }
       ];
     };