fix luacheck

Author: yngvar-antonsson

metrics/tarantool/memtx.lua

@@ -122,33 +122,33 @@ local function update()
 
     -- Tarantool 3.0 memory statistics
 
-    local ok, memtx_stat = pcall(box.stat.memtx)
+    local ok, memtx_stat_3 = pcall(box.stat.memtx)
     if not ok then
         return
     end
 
     collectors_list.memtx_tuples_data_total =
         utils.set_gauge('memtx_tuples_data_total',
             'Total amount of memory allocated for data tuples',
-            memtx_stat.data.total, nil, nil, {default = true})
+            memtx_stat_3.data.total, nil, nil, {default = true})
     collectors_list.memtx_tuples_data_read_view =
         utils.set_gauge('memtx_tuples_data_read_view',
             'Memory held for read views',
-            memtx_stat.data.read_view, {kind = "read_view"}, nil, {default = true})
+            memtx_stat_3.data.read_view, {kind = "read_view"}, nil, {default = true})
     collectors_list.memtx_tuples_data_garbage =
         utils.set_gauge('memtx_tuples_data_garbage',
             'Memory that is unused and scheduled to be freed',
-            memtx_stat.data.garbage, nil, nil, {default = true})
+            memtx_stat_3.data.garbage, nil, nil, {default = true})
 
 
     collectors_list.memtx_index_extents_total =
         utils.set_gauge('memtx_index_extents_total',
             'Total amount of memory allocated for indexing data',
-            memtx_stat.data.total, nil, nil, {default = true})
+            memtx_stat_3.data.total, nil, nil, {default = true})
     collectors_list.memtx_index_extents_read_view =
         utils.set_gauge('memtx_index_extents_read_view',
             'Memory held for read views',
-            memtx_stat.data.read_view, nil, nil, {default = true})
+            memtx_stat_3.data.read_view, nil, nil, {default = true})
 
 end