{ config, pkgs, ... }:
let
  cfg = config.services.loki;
  saveDirectory = "/tank/services/metrics/loki";
in {
  services.loki = {
    enable = true;
    dataDir = saveDirectory;
    configuration = {
      auth_enabled = false;
      server = {
        http_listen_port = 3100;
        http_listen_address = "0.0.0.0";
        grpc_listen_port = 9096;
      };

      ingester = {
        wal = {
          enabled = true;
          dir = "${saveDirectory}/wal";
        };
        lifecycler = {
          address = "127.0.0.1";
          ring = {
            kvstore = {
              store = "inmemory";
            };
            replication_factor = 1;
          };
          final_sleep = "0s";
        };
        chunk_idle_period = "1h";
      };

      schema_config = {
        configs = [
          {
            from = "2022-12-01";
            store = "boltdb-shipper";
            object_store = "filesystem";
            schema = "v11";
            index = {
              prefix = "index_";
              period = "24h";
            };
          }
        ];
      };

      storage_config = {
        boltdb_shipper = {
          active_index_directory = "${saveDirectory}/boltdb-shipper-index";
          cache_location = "${saveDirectory}/boltdb-shipper-cache";
          cache_ttl = "24h";
        };
        filesystem = {
          directory = "${saveDirectory}/chunks";
        };
      };

      limits_config = {
        allow_structured_metadata = false;
        reject_old_samples = true;
        reject_old_samples_max_age = "72h";
      };

      compactor = {
        working_directory = "${saveDirectory}/compactor";
      };
    };
  };

  networking.firewall.allowedTCPPorts = [
    cfg.configuration.server.http_listen_port
  ];
}