Added Loki Data collector

nixos/default.nix

@@ -4,7 +4,6 @@
   lib,
   primaryUser,
   isServer,
-  isDarwin,
   ...
 }:
 {
@@ -84,18 +83,41 @@
   };
 
   services = {
-    prometheus.exporters.node = lib.mkIf (!isDarwin) {
+    prometheus.exporters.node = {
       enable = true;
       port = 9002;
     };
 
+    alloy = {
+      enable = true;
+      extraFlags = [ "--stability.level=public-preview" ];
+      configPath = pkgs.writeText "config.alloy" ''
+        loki.write "default" {
+          endpoint {
+            url = "http://192.168.2.30:3100/loki/api/v1/push"
+          }
+        }
+
+        loki.source.journal "journal" {
+          forward_to = [loki.write.default.receiver]
+          labels = {
+            job  = "systemd-journal",
+            host = sys.env("HOSTNAME"),
+          }
+        }
+      '';
+    };
+
     gnome = lib.mkIf (!isServer) {
       tinysparql.enable = true;
       localsearch.enable = true;
     };
   };
 
-  networking.firewall.allowedTCPPorts = [ 9002 ];
+  networking.firewall.allowedTCPPorts = [
+    9002
+    3100
+  ];
 
   users.users.${primaryUser} = {
     home = "/home/${primaryUser}";

nixos/roles/monitoring.nix

@@ -39,6 +39,7 @@ in
       };
     };
 
+    # TODO: Computers should register themselves
     prometheus = {
       enable = true;
       port = 9001;
@@ -61,10 +62,55 @@ in
         }
       ];
     };
+
+    loki = {
+      enable = true;
+      configuration = {
+        auth_enabled = false;
+        server.http_listen_port = 3100;
+        ingester = {
+          lifecycler = {
+            address = "127.0.0.1";
+            ring = {
+              kvstore.store = "inmemory";
+              replication_factor = 1;
+            };
+          };
+          chunk_idle_period = "5m";
+          chunk_retain_period = "30s";
+        };
+        schema_config.configs = [
+          {
+            from = "2024-01-01";
+            store = "tsdb";
+            object_store = "filesystem";
+            schema = "v13";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+          }
+        ];
+        storage_config = {
+          tsdb_shipper = {
+            active_index_directory = "/var/lib/loki/tsdb-index";
+            cache_location = "/var/lib/loki/tsdb-cache";
+          };
+          filesystem.directory = "/var/lib/loki/chunks";
+        };
+        limits_config = {
+          reject_old_samples = true;
+          reject_old_samples_max_age = "168h";
+        };
+      };
+    };
   };
 
   networking.firewall.allowedTCPPorts = [
     80
+    443
+    # TODO: Remove
     9001
+    3100
   ];
 }

nixos/sops.nix

@@ -7,6 +7,7 @@
     secrets = {
       grafana_secret_key = {
         owner = "grafana";
+        group = "grafana";
       };
     };
   };