Add log level to config page

plugins/UiConfig/media/js/all.js

@@ -1419,7 +1419,7 @@
           }
         ]
       });
-      return section.items.push({
+      section.items.push({
         title: "Custom socks proxy address for trackers",
         key: "trackers_proxy",
         type: "text",
@@ -1433,6 +1433,24 @@
           };
         })(this)
       });
+      section = this.createSection("Performance");
+      return section.items.push({
+        key: "log_level",
+        title: "Level of logging to file",
+        type: "select",
+        options: [
+          {
+            title: "Everything",
+            value: "DEBUG"
+          }, {
+            title: "Only important messages",
+            value: "INFO"
+          }, {
+            title: "Only errors",
+            value: "ERROR"
+          }
+        ]
+      });
     };
 
     ConfigStorage.prototype.createSection = function(title) {