feat(server): add remote host metrics

configs/server.nix

@@ -1,5 +1,16 @@
-{config, ...}: {
-  imports = [./common.nix];
+{
+  config,
+  _utils,
+  ...
+}: let
+  secrets = _utils.setupSharedSecrets config {
+    secrets = ["vmAuthToken"];
+  };
+in {
+  imports = [
+    ./common.nix
+    secrets.generate
+  ];
 
   _module.args.nixinate = {
     host = config.networking.hostName;
@@ -27,5 +38,29 @@
       port = 9091;
       enabledCollectors = ["systemd"];
     };
+
+    vmagent = {
+      enable = true;
+      remoteWrite.url = "https://metrics.uku3lig.net/api/v1/write";
+      extraArgs = ["-remoteWrite.bearerToken $VM_AUTH_TOKEN"];
+      prometheusConfig = {
+        global.scrape_interval = "15s";
+
+        scrape_configs = [
+          {
+            job_name = "node";
+            static_configs = [{targets = ["localhost:${builtins.toString config.services.prometheus.exporters.node.port}"];}];
+            relabel_configs = [
+              {
+                target_label = "instance";
+                replacement = config.networking.hostName;
+              }
+            ];
+          }
+        ];
+      };
+    };
   };
+
+  systemd.services.vmagent.serviceConfig.EnvironmentFile = secrets.get "vmAuthToken";
 }