feat(modules): add metrics

1 files changed, 155 insertions, 0 deletions

diff --git a/modules/services/metrics.nix b/modules/services/metrics.nix
new file mode 100644
index 0000000..55f3bee
--- /dev/null
+++ b/modules/services/metrics.nix
@@ -0,0 +1,155 @@
+{ config, lib, ... }:
+
+with lib;
+let
+  cfg = config.modules.services.metrics;
+in
+{
+  options.modules.services.metrics = {
+    enable = mkEnableOption "metrics";
+    realHost = mkOption { type = types.str; };
+    secrets.adminPassword = mkOption { type = types.path; description = "path to the admin password"; };
+  };
+
+  config = mkIf cfg.enable {
+    services.prometheus = {
+      enable = true;
+      port = 9001;
+
+      exporters = {
+        node = {
+          enable = true;
+          enabledCollectors = [ "systemd" ];
+          port = 9002;
+        };
+      };
+
+      scrapeConfigs = [
+        {
+          job_name = "node";
+          static_configs = [{
+            targets = [ "127.0.0.1:${toString config.services.prometheus.exporters.node.port}" ];
+          }];
+        }
+      ];
+    };
+
+    services.loki = {
+      enable = true;
+      configuration = {
+        auth_enabled = false;
+        server.http_listen_port = 9003;
+
+        ingester = {
+          lifecycler = {
+            address = "127.0.0.1";
+            ring.kvstore.store = "inmemory";
+            ring.replication_factor = 1;
+            final_sleep = "0s";
+          };
+
+          chunk_idle_period = "1h";
+          max_chunk_age = "1h";
+          chunk_target_size = 1048576; # 1.5M
+          chunk_retain_period = "30s";
+          max_transfer_retries = 0;
+        };
+
+        schema_config.configs = [
+          {
+            from = "2023-02-24";
+            store = "boltdb-shipper";
+            object_store = "filesystem";
+            schema = "v11";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+          }
+        ];
+
+        storage_config = {
+          boltdb_shipper = {
+            active_index_directory = "/var/lib/loki/boltdb-shipper-active";
+            cache_location = "/var/lib/loki/boltdb-shipper-cache";
+            cache_ttl = "24h";
+            shared_store = "filesystem";
+          };
+
+          filesystem.directory = "/var/lib/loki/chunks";
+        };
+
+        limits_config = {
+          reject_old_samples = true;
+          reject_old_samples_max_age = "168h";
+
+          retention_period = "120h";
+        };
+
+        chunk_store_config = {
+          max_look_back_period = "0s";
+        };
+
+        table_manager = {
+          retention_deletes_enabled = true;
+          retention_period = "120h";
+        };
+
+        compactor = {
+          working_directory = "/var/lib/loki";
+          shared_store = "filesystem";
+          compactor_ring.kvstore.store = "inmemory";
+        };
+      };
+    };
+
+    services.promtail = {
+      enable = true;
+      configuration = {
+        server = {
+          http_listen_port = 9004;
+          grpc_listen_port = 0;
+        };
+        positions.filename = "/tmp/positions.yaml";
+        clients = [
+          { url = "http://127.0.0.1:${toString config.services.loki.configuration.server.http_listen_port}/loki/api/v1/push"; }
+        ];
+        scrape_configs = [
+          {
+            job_name = "journal";
+            journal = {
+              max_age = "12h";
+              labels = {
+                job = "systemd-journal";
+                host = config.networking.hostName;
+              };
+            };
+            relabel_configs = [
+              {
+                source_labels = [ "__journal__systemd_unit" ];
+                target_label = "unit";
+              }
+            ];
+          }
+        ];
+      };
+    };
+
+    services.grafana = {
+      enable = true;
+
+      settings.server.http_addr = "127.0.0.1";
+      settings.server.http_port = 4001;
+      # settings.server.domain = cfg.realHost;
+      settings.security.admin_password = "$__file{${cfg.secrets.adminPassword}}";
+      settings.analytics.reporting_enabled = false;
+    };
+
+    modules.persistence.directories = [
+      "/var/lib/prometheus2"
+      "/var/lib/loki"
+      "/var/lib/grafana"
+    ];
+  };
+}
+