Do not show system notes on commits in the MR page

app/models/merge_request.rb

@@ -858,15 +858,6 @@ class MergeRequest < ApplicationRecord
   end
 
   def related_notes
-    # Fetch comments only from last 100 commits
-    commits_for_notes_limit = 100
-    commit_ids = commit_shas.take(commits_for_notes_limit)
-
-    commit_notes = Note
-      .except(:order)
-      .where(project_id: [source_project_id, target_project_id])
-      .for_commit_id(commit_ids)
-
     # We're using a UNION ALL here since this results in better performance
     # compared to using OR statements. We're using UNION ALL since the queries
     # used won't produce any duplicates (e.g. a note for a commit can't also be
@@ -878,6 +869,16 @@ class MergeRequest < ApplicationRecord
 
   alias_method :discussion_notes, :related_notes
 
+  def commit_notes
+    # Fetch comments only from last 100 commits
+    commit_ids = commit_shas.take(100)
+
+    Note
+      .user
+      .where(project_id: [source_project_id, target_project_id])
+      .for_commit_id(commit_ids)
+  end
+
   def mergeable_discussions_state?
     return true unless project.only_allow_merge_if_all_discussions_are_resolved?
 

changelogs/unreleased/55268-exclude-system-notes-from-commits-in-mr.yml

@@ -0,0 +1,5 @@
+---
+title: Exclude system notes from commits in merge request discussions
+merge_request: 26396
+author:
+type: fixed

spec/models/merge_request_spec.rb

@@ -805,6 +805,14 @@ describe MergeRequest do
       expect(merge_request.commits).not_to be_empty
       expect(merge_request.related_notes.count).to eq(3)
     end
+
+    it "excludes system notes for commits" do
+      system_note = create(:note_on_commit, :system, commit_id: merge_request.commits.first.id,
+                                                     project: merge_request.project)
+
+      expect(merge_request.related_notes.count).to eq(2)
+      expect(merge_request.related_notes).not_to include(system_note)
+    end
   end
 
   describe '#for_fork?' do