Add promtail for journal

system/monitoring/default.nix

@@ -0,0 +1,7 @@
+{ ... }:
+{
+  imports = [
+    ./metrics.nix
+    ./logs.nix
+  ];
+}

system/monitoring/logs.nix

@@ -0,0 +1,37 @@
+{ ... }:
+{
+  services.promtail = {
+    enable = true;
+    configuration = {
+      server = {
+        http_listen_address = "0.0.0.0";
+        http_listen_port = 9099;
+      };
+
+      clients = [
+        {
+          url = "http://monitoring01.home.2rjus.net:3100/loki/api/v1/push";
+        }
+      ];
+
+      scrape_configs = [
+        {
+          job_name = "journal";
+          journal = {
+            json = true;
+          };
+          relabel_configs = [
+            {
+              source_labels = [ "__journal__systemd_unit" ];
+              target_label = "systemd_unit";
+            }
+            {
+              source_labels = [ "__journal__hostname" ];
+              target_label = "host";
+            }
+          ];
+        }
+      ];
+    };
+  };
+}

system/monitoring/metrics.nix

@@ -0,0 +1,33 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    prometheus-node-exporter
+    prometheus-systemd-exporter
+  ];
+
+  systemd.services."node-exporter" = {
+    enable = true;
+    unitConfig = {
+      Description = "Prometheus Node Exporter";
+      After = [ "network.target" ];
+    };
+    serviceConfig = {
+      ExecStart = "${pkgs.prometheus-node-exporter}/bin/node_exporter";
+    };
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  systemd.services."systemd-exporter" = {
+    enable = true;
+    unitConfig = {
+      Description = "Prometheus Systemd Exporter";
+      After = [ "network.target" ];
+    };
+    serviceConfig = {
+      ExecStart = "${pkgs.prometheus-systemd-exporter}/bin/systemd_exporter";
+    };
+    wantedBy = [ "multi-user.target" ];
+  };
+
+  networking.firewall.allowedTCPPorts = [ 9100 9558 ];
+}