Enable Prometheus/Grafana/Loki

modules/loki/default.nix

@@ -0,0 +1,67 @@
+{config, ...}: let
+  cfg = config.services.loki;
+in {
+  services.loki = {
+    enable = true;
+    configuration = {
+      # Basic stuff
+      auth_enabled = false;
+      server = {
+        http_listen_port = 3100;
+        log_level = "warn";
+      };
+      common = {
+        path_prefix = config.services.loki.dataDir;
+        storage.filesystem = {
+          chunks_directory = "${cfg.dataDir}/chunks";
+          rules_directory = "${cfg.dataDir}/rules";
+        };
+        replication_factor = 1;
+        ring.kvstore.store = "inmemory";
+        ring.instance_addr = "127.0.0.1";
+      };
+
+      ingester.chunk_encoding = "snappy";
+
+      limits_config = {
+        retention_period = "120h";
+        ingestion_burst_size_mb = 16;
+        reject_old_samples = true;
+        reject_old_samples_max_age = "12h";
+      };
+
+      table_manager = {
+        retention_deletes_enabled = true;
+        retention_period = "120h";
+      };
+
+      compactor = {
+        retention_enabled = true;
+        compaction_interval = "10m";
+        working_directory = "${cfg.dataDir}/compactor";
+        delete_request_cancel_period = "10m"; # don't wait 24h before processing the delete_request
+        retention_delete_delay = "2h";
+        retention_delete_worker_count = 150;
+        delete_request_store = "filesystem";
+      };
+
+      schema_config.configs = [
+        {
+          from = "2020-11-08";
+          store = "tsdb";
+          object_store = "filesystem";
+          schema = "v13";
+          index.prefix = "index_";
+          index.period = "24h";
+        }
+      ];
+
+      query_range.cache_results = true;
+      limits_config.split_queries_by_interval = "24h";
+    };
+  };
+
+  environment.persistence."/persist".directories = [
+    cfg.dataDir
+  ];
+}