Split status and confidentiality action

app/models/system_note_metadata.rb

 class SystemNoteMetadata < ActiveRecord::Base
   ICON_TYPES = %w[
-    commit merge confidentiality status label assignee cross_reference
-    title time_tracking branch milestone discussion task moved
+    commit merge confidential visible label assignee cross_reference
+    title time_tracking branch milestone discussion task moved opened closed merged
   ].freeze
 
   validates :note, presence: true

app/services/system_note_service.rb

@@ -183,7 +183,9 @@ module SystemNoteService
     body = status.dup
     body << " via #{source.gfm_reference(project)}" if source
 
-    create_note(NoteSummary.new(noteable, project, author, body, action: 'status'))
+    action = status == 'reopened' ? 'opened' : status
+
+    create_note(NoteSummary.new(noteable, project, author, body, action: action))
   end
 
   # Called when 'merge when pipeline succeeds' is executed
@@ -273,9 +275,15 @@ module SystemNoteService
   #
   # Returns the created Note object
   def change_issue_confidentiality(issue, project, author)
-    body = issue.confidential ? 'made the issue confidential' : 'made the issue visible to everyone'
+    if issue.confidential
+      body = 'made the issue confidential'
+      action = 'confidential'
+    else
+      body = 'made the issue visible to everyone'
+      action = 'visible'
+    end
 
-    create_note(NoteSummary.new(issue, project, author, body, action: 'confidentiality'))
+    create_note(NoteSummary.new(issue, project, author, body, action: action))
   end
 
   # Called when a branch in Noteable is changed

spec/services/system_note_service_spec.rb

@@ -221,26 +221,23 @@ describe SystemNoteService, services: true do
   describe '.change_status' do
     subject { described_class.change_status(noteable, project, author, status, source) }
 
-    let(:status) { 'new_status' }
-    let(:source) { nil }
+    context 'with status reopened' do
+      let(:status) { 'reopened' }
+      let(:source) { nil }
 
-    it_behaves_like 'a system note' do
-      let(:action) { 'status' }
+      it_behaves_like 'a system note' do
+        let(:action) { 'opened' }
+      end
     end
 
     context 'with a source' do
+      let(:status) { 'opened' }
       let(:source) { double('commit', gfm_reference: 'commit 123456') }
 
       it 'sets the note text' do
         expect(subject.note).to eq "#{status} via commit 123456"
       end
     end
-
-    context 'without a source' do
-      it 'sets the note text' do
-        expect(subject.note).to eq status
-      end
-    end
   end
 
   describe '.merge_when_pipeline_succeeds' do
@@ -298,9 +295,23 @@ describe SystemNoteService, services: true do
   describe '.change_issue_confidentiality' do
     subject { described_class.change_issue_confidentiality(noteable, project, author) }
 
-    context 'when noteable responds to `confidential`' do
+    context 'issue has been made confidential' do
+      before do
+        noteable.update_attribute(:confidential, true)
+      end
+
+      it_behaves_like 'a system note' do
+        let(:action) { 'confidential' }
+      end
+
+      it 'sets the note text' do
+        expect(subject.note).to eq 'made the issue confidential'
+      end
+    end
+
+    context 'issue has been made visible' do
       it_behaves_like 'a system note' do
-        let(:action) { 'confidentiality' }
+        let(:action) { 'visible' }
       end
 
       it 'sets the note text' do