Add promtail for journal

system/default.nix

@@ -1,7 +1,7 @@
 { ... }:
 {
   imports = [
-    ./monitoring.nix
+    ./monitoring
     ./packages.nix
     ./root-user.nix
     ./root-ca.nix

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";
+            }
+          ];
+        }
+      ];
+    };
+  };
+}