Add a new metrics stack

hosts/ildkule/services/metrics/loki.nix

@@ -0,0 +1,79 @@
+{ config, pkgs, ... }:
+
+{
+  services.loki = {
+    enable = true;
+    configuration = {
+      auth_enabled = false;
+      server = {
+        http_listen_port = 3100;
+        grpc_listen_port = 9096;
+      };
+
+      ingester = {
+        wal = {
+          enabled = true;
+          dir = "/var/lib/loki/wal";
+        };
+        lifecycler = {
+          ring = {
+            kvstore = {
+              store = "inmemory";
+            };
+            replication_factor = 1;
+          };
+          final_sleep = "0s";
+        };
+        chunk_idle_period = "10m";
+      };
+
+      schema_config = {
+        configs = [
+          {
+            from = "2022-01-01";
+            store = "boltdb";
+            object_store = "filesystem";
+            schema = "v11";
+            index = {
+              prefix = "index_";
+              period = "48h";
+            };
+          }
+        ];
+      };
+
+      storage_config = {
+        boltdb_shipper = {
+          active_index_directory = "/var/lib/loki/index";
+          shared_store = "filesystem";
+          cache_ttl = "24h";
+        };
+        filesystem = {
+          directory = "/var/lib/loki/chunks";
+        };
+      };
+
+      limits_config = {
+        enforce_metric_name = false;
+        reject_old_samples = true;
+        reject_old_samples_max_age = "72h";
+      };
+
+      compactor = {
+        working_directory = "/var/lib/loki/compactor";
+        shared_store = "filesystem";
+      };
+
+      # ruler = {
+      #   storage = {
+      #     type = "local";
+      #     local = {
+      #       directory = "/var/lib/loki/rules";
+      #     };
+      #   };
+      #   rule_path = "/etc/loki/rules";
+      #   alertmanager_url = "http://localhost:9093";
+      # };
+    };
+  };
+}