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# Loki Server
#
# Scope: Log aggregator

{
  config.networking.firewall.allowedTCPPorts = [ 3100 ];

  config.services.loki = {
    enable = true;

    configuration =
      {
        auth_enabled = false;

        server = {
          http_listen_port = 3100;
        };

        ingester = {
          lifecycler = {
            address = "0.0.0.0";
            ring = {
              kvstore = {
                store = "inmemory";
              };
              replication_factor = 1;
            };
            final_sleep = "0s";
          };
          chunk_idle_period = "1h"; # Any chunk not receiving new logs in this time will be flushed
          max_chunk_age = "1h"; # All chunks will be flushed when they hit this age, default is 1h
          chunk_target_size = 1048576; # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
          chunk_retain_period = "30s"; # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
          max_transfer_retries = 0; # Chunk transfers disabled
        };

        schema_config = {
          configs = [{
            from = "2020-10-24"; # TODO: Should this be "today"?
            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";         # Can be increased for faster performance over longer query periods, uses more disk space
            shared_store = "filesystem";
          };
          filesystem = {
            directory = "/var/lib/loki/chunks";
          };
        };

        limits_config = {
          reject_old_samples = true;
          reject_old_samples_max_age = "168h";
        };

        chunk_store_config = {
          max_look_back_period = "336h";
        };

        table_manager = {
          retention_deletes_enabled = true;
          retention_period = "336h";
        };
      };
  };
}