Add grafana

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/console/telegraf/default.nix

@@ -0,0 +1,58 @@
+{
+  user ? throw "user argument is required",
+  home ? throw "home argument is required",
+}:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  port = 9273 + config.users.users.${user}.uid;
+  hmConfig = config.home-manager.users.${user};
+in
+{
+  home-manager.users.${user}.systemd.user.services.telegraf =
+    let
+      telegrafConfig = (pkgs.formats.toml { }).generate "config.toml" {
+        agent.quiet = true;
+
+        outputs.prometheus_client = [ { listen = ":${builtins.toString port}"; } ];
+
+        inputs =
+          {
+            systemd_units = [
+              { scope = "user"; }
+            ];
+          }
+          // lib.attrsets.optionalAttrs hmConfig.services.podman.enable {
+            docker = [
+              {
+                endpoint =
+                  let
+                    uid = builtins.toString config.users.users.${user}.uid;
+                  in
+                  "unix:///var/run/user/${uid}/podman/podman.sock";
+                perdevice = false;
+                perdevice_include = [
+                  "cpu"
+                  "blkio"
+                  "network"
+                ];
+              }
+            ];
+          };
+      };
+    in
+    {
+      Unit.Description = "Telegraf Agent";
+
+      Install.WantedBy = [ "default.target" ];
+
+      Service = {
+        ExecStart = "${config.services.telegraf.package}/bin/telegraf -config ${telegrafConfig}";
+        ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
+      };
+    };
+}