Added monitoring

moduler/services/monitoring/default.nix

@@ -0,0 +1,71 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+{
+  options = {
+    grafana = {
+      enable = lib.mkEnableOption "enables grafana";
+      host = lib.mkDefault "127.0.0.1";
+      port = lib.mkDefault 2342;
+      domain = lib.mkOption {
+        type = lib.types.str;
+        description = "Domain name for Grafana to be served on.";
+      };
+    };
+    prometheus = {
+      enable = lib.mkEnableOption "enables prometheus";
+      port = lib.mkDefault 9001;
+      exporter = {
+        enable = lib.mkEnableOption "enables node exporter";
+        port = lib.mkDefault 9002;
+      };
+    };
+  };
+
+  config = lib.mkMerge [
+    (lib.mkIf config.grafana.enable {
+      services.grafana = {
+        enable = true;
+        domain = config.grafana.domain;
+        port = config.grafana.port;
+        addr = config.grafana.host;
+      };
+
+      # nginx reverse proxy
+      services.nginx.virtualHosts."${config.grafana.domain}" = {
+        locations."/" = {
+          proxyPass = "http://${config.grafana.host}:${toString config.grafana.port}";
+          proxyWebsockets = true;
+        };
+      };
+    })
+
+    (lib.mkIf config.prometheus.enable {
+      services.prometheus = {
+        enable = true;
+        port = config.prometheus.port;
+        exporters = lib.mkIf config.prometheus.exporters {
+          node = {
+            enable = true;
+            enabledCollectors = [ "systemd" ];
+            port = config.prometheus.exporters.port;
+          };
+        };
+        scrapeConfigs = [
+          {
+            job_name = "chrysalis";
+            static_configs = [
+              {
+                targets = [ "${config.grafana.host}:${toString config.prometheus.exporters.port}" ];
+              }
+            ];
+          }
+        ];
+
+      };
+    })
+  ];
+}