Improve error handling and reporting after command rewrite

PluralKit.Bot/Utils.cs

@@ -2,9 +2,11 @@ using System;
 using System.Globalization;
 using System.Linq;
 using System.Net.Http;
+using System.Net.Sockets;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Discord;
+using Discord.Net;
 
 using PluralKit.Core;
 using Image = SixLabors.ImageSharp.Image;
@@ -117,6 +119,24 @@ namespace PluralKit.Bot
 
         public static async Task<bool> HasPermission(this IChannel channel, ChannelPermission permission) =>
             (await PermissionsIn(channel)).Has(permission);
+
+        public static bool IsOurProblem(this Exception e)
+        {
+            // This function filters out sporadic errors out of our control from being reported to Sentry
+            // otherwise we'd blow out our error reporting budget as soon as Discord takes a dump, or something.
+            
+            // Discord server errors are *not our problem*
+            if (e is HttpException he && ((int) he.HttpCode) >= 500) return false;
+            
+            // Socket errors are *not our problem*
+            if (e is SocketException) return false;
+            
+            // Tasks being cancelled for whatver reason are, you guessed it, also not our problem.
+            if (e is TaskCanceledException) return false;
+            
+            // This may expanded at some point.
+            return true;
+        }
     }
 
     /// <summary>