Reduce notification output when exceptions are encountered

osu.Game/OsuGame.cs

@@ -220,15 +220,7 @@ namespace osu.Game
                 Depth = -6,
             }, overlayContent.Add);
 
-            Logger.NewEntry += entry =>
+            forwardLoggedErrorsToNotifications();
-            {
-                if (entry.Level < LogLevel.Important) return;
-
-                notifications.Post(new SimpleNotification
-                {
-                    Text = $@"{entry.Level}: {entry.Message}"
-                });
-            };
 
             dependencies.Cache(settings);
             dependencies.Cache(social);
@@ -290,6 +282,36 @@ namespace osu.Game
             Cursor.State = Visibility.Hidden;
         }
 
+        private void forwardLoggedErrorsToNotifications()
+        {
+            int recentErrorCount = 0;
+
+            const double debounce = 5000;
+
+            Logger.NewEntry += entry =>
+            {
+                if (entry.Level < LogLevel.Error || entry.Target == null) return;
+
+                if (recentErrorCount < 2)
+                {
+                    notifications.Post(new SimpleNotification
+                    {
+                        Icon = FontAwesome.fa_bomb,
+                        Text = (recentErrorCount == 0 ? entry.Message : "Subsequent errors occurred and have been logged.") + "\nClick to view log files.",
+                        Activated = () =>
+                        {
+                            Host.Storage.GetStorageForDirectory("logs").OpenInNativeExplorer();
+                            return true;
+                        }
+                    });
+                }
+
+                recentErrorCount++;
+
+                Scheduler.AddDelayed(() => recentErrorCount--, debounce);
+            };
+        }
+
         private Task asyncLoadStream;
 
         private void loadComponentSingleFile<T>(T d, Action<T> add)