Do not logs all internal events

BTCPayServer/Events/InvoiceNeedUpdateEvent.cs

@@ -15,7 +15,7 @@ namespace BTCPayServer.Events
 
         public override string ToString()
         {
-            return string.Empty;
+            return $"Invoice {InvoiceId} needs update";
         }
     }
 }

BTCPayServer/Events/InvoicePaymentMethodActivated.cs

@@ -18,7 +18,7 @@ namespace BTCPayServer.Events
 
         public override string ToString()
         {
-            return string.Empty;
+            return $"Invoice payment method activated for invoice {InvoiceId} ({PaymentMethodId.ToPrettyString()})";
         }
     }
 }

BTCPayServer/Events/SettingsChanged.cs

@@ -5,7 +5,7 @@ namespace BTCPayServer.Events
         public T Settings { get; set; }
         public override string ToString()
         {
-            return Settings?.ToString() ?? string.Empty;
+            return $"Settings {typeof(T).Name} changed";
         }
     }
 }

BTCPayServer/Events/WalletChangedEvent.cs

@@ -7,7 +7,7 @@ namespace BTCPayServer.Events
         public WalletId WalletId { get; set; }
         public override string ToString()
         {
-            return String.Empty;
+            return $"Wallet {WalletId} changed";
         }
     }
 }

BTCPayServer/Program.cs

@@ -45,6 +45,7 @@ namespace BTCPayServer
                     .ConfigureLogging(l =>
                     {
                         l.AddFilter("Microsoft", LogLevel.Error);
+                        l.AddFilter("Events", LogLevel.Warning);
                         l.AddFilter("System.Net.Http.HttpClient", LogLevel.Critical);
                         l.AddFilter("Microsoft.AspNetCore.Antiforgery.Internal", LogLevel.Critical);
                         l.AddFilter("Fido2NetLib.DistributedCacheMetadataService", LogLevel.Error);