Adding log messages for ipynbdiff

app/presenters/blob_presenter.rb

@@ -121,6 +121,19 @@ class BlobPresenter < Gitlab::View::Presenter::Delegated
   end
 
   def transformed_blob_data
-    @transformed_blob ||= ( blob.path.ends_with?('.ipynb') && IpynbDiff.transform(blob.data, options: { include_metadata: false, cell_decorator: :percent }) ) || blob.data
+    @transformed_blob ||= if blob.path.ends_with?('.ipynb')
+                            begin
+                              new_blob = IpynbDiff.transform(blob.data,
+                                                             raise_errors: true,
+                                                             options: { include_metadata: false, cell_decorator: :percent })
+                            rescue IpynbDiff::InvalidNotebookError => e
+                              Gitlab::ErrorTracking.track_and_raise_for_dev_exception(e, issue_url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/344676')
+                              return blob.data
+                            end
+
+                            return Gitlab::AppLogger.info('IPYNBDIFF_BLOB_NIL') && blob.data unless new_blob
+
+                            Gitlab::AppLogger.info('IPYNBDIFF_BLOB_GENERATED') && new_blob
+                          end
   end
 end

lib/gitlab/diff/file.rb

@@ -456,11 +456,21 @@ module Gitlab
         from = old_blob_lazy&.data
         to = new_blob_lazy&.data
 
-        new_diff = IpynbDiff.diff(from, to,
-                                  diff_opts: { context: 5, include_diff_info: true },
-                                  transform_options: { cell_decorator: :percent } )
-
-        diff.diff = new_diff.scan(/.*\n/)[2..-1].join('') if new_diff
+        begin
+          new_diff = IpynbDiff.diff(from, to,
+                                    diff_opts: { context: 5, include_diff_info: true },
+                                    transform_options: { cell_decorator: :percent },
+                                    raise_if_invalid_notebook: true)
+
+          if new_diff
+            diff.diff = new_diff.scan(/.*\n/)[2..-1].join('')
+            Gitlab::AppLogger.info("IPYNB_DIFF_GENERATED")
+          else
+            Gitlab::AppLogger.info("IPYNB_DIFF_NIL")
+          end
+        rescue IpynbDiff::InvalidNotebookError => e
+          Gitlab::ErrorTracking.track_and_raise_for_dev_exception(e, issue_url: 'https://gitlab.com/gitlab-org/gitlab/-/issues/344676')
+        end
       end
 
       def alternate_viewer_class