Fix Loki object store setup

nix/monitoring/configuration.nix

@@ -118,6 +118,16 @@
               period = "24h";
             };
           }
+          {
+            from = "2024-05-01";
+            store = "tsdb";
+            object_store = "filesystem";
+            schema = "v13";
+            index = {
+              prefix = "index_";
+              period = "24h";
+            };
+          }
         ];
       };
 
@@ -127,6 +137,11 @@
           cache_location = "/var/lib/loki/boltdb-shipper-cache";
           cache_ttl = "24h";
         };
+        tsdb_shipper = {
+          active_index_directory = "/var/lib/loki/tsdb-shipper-active";
+          cache_location = "/var/lib/loki/tsdb-shipper-cache";
+          cache_ttl = "24h";
+        };
 
         filesystem = {
           directory = "/var/lib/loki/chunks";