Add sentry tracking to masking helper

app/helpers/routing/pseudonymization_helper.rb

@@ -6,7 +6,8 @@ def masked_page_url
       return unless Feature.enabled?(:mask_page_urls, type: :ops)
 
       mask_params(Rails.application.routes.recognize_path(request.original_fullpath))
-    rescue ActionController::RoutingError, URI::InvalidURIError
+    rescue ActionController::RoutingError, URI::InvalidURIError => e
+      Gitlab::ErrorTracking.track_exception(e, url: request.original_fullpath)
       nil
     end
 

spec/helpers/routing/pseudonymization_helper_spec.rb

@@ -129,6 +129,20 @@
     end
   end
 
+  describe 'when it raises exception' do
+    context 'calls error tracking exception' do
+      it 'sends error to sentry' do
+        allow(helper).to receive(:mask_params).with(anything).and_raise(ActionController::RoutingError, 'Some routing error')
+
+        expect(Gitlab::ErrorTracking).to receive(:track_exception).with(
+          ActionController::RoutingError,
+          url: '').and_call_original
+
+        expect(helper.masked_page_url).to be_nil
+      end
+    end
+  end
+
   describe 'when feature flag is disabled' do
     before do
       stub_feature_flags(mask_page_urls: false)