feat(server/grafana,server/prometheus): add prometheus datasource and node exporter config

modules/nixos/server/monitoring/grafana/default.nix

@@ -19,7 +19,6 @@ in
       extraConfig.proxyWebsockets = true;
       locations."/api/live/" = {
         proxyPass = "http://${config.system.hostname}:${builtins.toString cfg.port}";
-        proxyWebsockets = true;
       };
     });
     services.grafana = {
@@ -29,6 +28,13 @@ in
         http_port = cfg.port;
         http_addr = "0.0.0.0";
       };
+      provision.datasources.settings.datasources = [
+        {
+          name = "prometheus";
+          type = "Prometheus";
+          url = "http://${config.system.hostname}:${builtins.toString config.server.monitoring.prometheus.port}";
+        }
+      ];
     };
   };
 }

modules/nixos/server/monitoring/prometheus/default.nix

@@ -3,6 +3,7 @@ let
   inherit (lib) mkEnableOption mkIf;
   inherit (lib.pantheon) mkPortOption;
   cfg = config.server.monitoring.prometheus;
+  upstreamCfg = config.services.prometheus;
 in
 {
   options.server.monitoring.prometheus = {
@@ -14,6 +15,22 @@ in
     services.prometheus = {
       enable = true;
       inherit (cfg) port;
+      scrapeConfigs = [
+        {
+          job_name = "chrysalis";
+          static_configs = [
+            {
+              targets = [ "127.0.0.1:${toString upstreamCfg.exporters.node.port}" ];
+            }
+          ];
+        }
+      ];
+
+      exporters.node = {
+        enable = true;
+        enabledCollectors = [ "systemd" ];
+        port = 9091;
+      };
     };
   };
 }