[state] add configurable warning level based on url length

src/ui/public/config/defaults.js

@@ -228,6 +228,15 @@ export default function configDefaultsProvider() {
       value: 5000,
       description: 'The time in milliseconds which an information notification ' +
         'will be displayed on-screen for. Setting to Infinity will disable.'
-    }
+    },
+    'warn:urlLength': {
+      value: 1900,
+      description: `
+        When the application url reaches this length we will start warning about
+        potential issues. Internet Explorer supports urls up to
+        <a href="https://support.microsoft.com/en-us/kb/208427">2,083 characters</a> long.
+        If IE compatibility is not important this can probably be disabled (set to 0).
+      `,
+    },
   };
 };

src/ui/public/state_management/state.js

@@ -6,7 +6,8 @@ import EventsProvider from 'ui/events';
 import Notifier from 'ui/notify/notifier';
 
 
-export default function StateProvider(Private, $rootScope, $location) {
+export default function StateProvider(Private, $rootScope, $location, config) {
+  var notify = new Notifier();
   var Events = Private(EventsProvider);
 
   _.class(State).inherits(Events);
@@ -44,7 +45,6 @@ export default function StateProvider(Private, $rootScope, $location) {
     try {
       return search[this._urlParam] ? rison.decode(search[this._urlParam]) : null;
     } catch (e) {
-      var notify = new Notifier();
       notify.error('Unable to parse URL');
       search[this._urlParam] = rison.encode(this._defaults);
       $location.search(search).replace();
@@ -107,6 +107,14 @@ export default function StateProvider(Private, $rootScope, $location) {
     } else {
       $location.search(search);
     }
+
+    const warnLength = config.get('warn:urlLength');
+    if (warnLength && $location.absUrl().length > warnLength) {
+      notify.warning(`
+        The URL has gotten big and may cause Kibana
+        to stop working. Please simplify the data on screen.
+      `);
+    }
   };
 
   /**