diff --git a/.rubocop.yml b/.rubocop.yml
index 037e8c4e00f..2944b3555e8 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -355,7 +355,6 @@ RSpec/LeakyConstantDeclaration:
     - 'spec/lib/gitlab/quick_actions/dsl_spec.rb'
     - 'spec/lib/marginalia_spec.rb'
     - 'spec/mailers/notify_spec.rb'
-    - 'spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb'
     - 'spec/models/concerns/batch_destroy_dependent_associations_spec.rb'
     - 'spec/models/concerns/bulk_insert_safe_spec.rb'
     - 'spec/models/concerns/bulk_insertable_associations_spec.rb'
diff --git a/app/models/chat_team.rb b/app/models/chat_team.rb
index 28aab279545..6e39d7e2204 100644
--- a/app/models/chat_team.rb
+++ b/app/models/chat_team.rb
@@ -12,6 +12,6 @@ class ChatTeam < ApplicationRecord
     # Either the group is not found, or the user doesn't have the proper
     # access on the mattermost instance. In the first case, we're done either way
     # in the latter case, we can't recover by retrying, so we just log what happened
-    Rails.logger.error("Mattermost team deletion failed: #{e}") # rubocop:disable Gitlab/RailsLogger
+    Gitlab::AppLogger.error("Mattermost team deletion failed: #{e}")
   end
 end
diff --git a/app/models/project.rb b/app/models/project.rb
index c657e76c86f..314f24f3f6d 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -925,17 +925,15 @@ class Project < ApplicationRecord
     job_id
   end
 
-  # rubocop:disable Gitlab/RailsLogger
   def log_import_activity(job_id, type: :import)
     job_type = type.to_s.capitalize
 
     if job_id
-      Rails.logger.info("#{job_type} job scheduled for #{full_path} with job ID #{job_id}.")
+      Gitlab::AppLogger.info("#{job_type} job scheduled for #{full_path} with job ID #{job_id}.")
     else
-      Rails.logger.error("#{job_type} job failed to create for #{full_path}.")
+      Gitlab::AppLogger.error("#{job_type} job failed to create for #{full_path}.")
     end
   end
-  # rubocop:enable Gitlab/RailsLogger
 
   def reset_cache_and_import_attrs
     run_after_commit do
@@ -1776,17 +1774,15 @@ class Project < ApplicationRecord
     ensure_pages_metadatum.update!(deployed: false)
   end
 
-  # rubocop:disable Gitlab/RailsLogger
   def write_repository_config(gl_full_path: full_path)
     # We'd need to keep track of project full path otherwise directory tree
     # created with hashed storage enabled cannot be usefully imported using
     # the import rake task.
     repository.raw_repository.write_config(full_path: gl_full_path)
   rescue Gitlab::Git::Repository::NoRepository => e
-    Rails.logger.error("Error writing to .git/config for project #{full_path} (#{id}): #{e.message}.")
+    Gitlab::AppLogger.error("Error writing to .git/config for project #{full_path} (#{id}): #{e.message}.")
     nil
   end
-  # rubocop:enable Gitlab/RailsLogger
 
   def after_import
     repository.expire_content_cache
@@ -1829,17 +1825,15 @@ class Project < ApplicationRecord
     @pipeline_status ||= Gitlab::Cache::Ci::ProjectPipelineStatus.load_for_project(self)
   end
 
-  # rubocop:disable Gitlab/RailsLogger
   def add_export_job(current_user:, after_export_strategy: nil, params: {})
     job_id = ProjectExportWorker.perform_async(current_user.id, self.id, after_export_strategy, params)
 
     if job_id
-      Rails.logger.info "Export job started for project ID #{self.id} with job ID #{job_id}"
+      Gitlab::AppLogger.info "Export job started for project ID #{self.id} with job ID #{job_id}"
     else
-      Rails.logger.error "Export job failed to start for project ID #{self.id}"
+      Gitlab::AppLogger.error "Export job failed to start for project ID #{self.id}"
     end
   end
-  # rubocop:enable Gitlab/RailsLogger
 
   def import_export_shared
     @import_export_shared ||= Gitlab::ImportExport::Shared.new(self)
diff --git a/app/models/project_import_state.rb b/app/models/project_import_state.rb
index e434ea58729..dfe660ac780 100644
--- a/app/models/project_import_state.rb
+++ b/app/models/project_import_state.rb
@@ -84,7 +84,7 @@ class ProjectImportState < ApplicationRecord
 
     update_column(:last_error, sanitized_message)
   rescue ActiveRecord::ActiveRecordError => e
-    Rails.logger.error("Error setting import status to failed: #{e.message}. Original error: #{sanitized_message}") # rubocop:disable Gitlab/RailsLogger
+    Gitlab::AppLogger.error("Error setting import status to failed: #{e.message}. Original error: #{sanitized_message}")
   ensure
     @errors = original_errors
   end
diff --git a/changelogs/unreleased/leaky-constant-fix-22.yml b/changelogs/unreleased/leaky-constant-fix-22.yml
new file mode 100644
index 00000000000..ebeaceee09f
--- /dev/null
+++ b/changelogs/unreleased/leaky-constant-fix-22.yml
@@ -0,0 +1,5 @@
+---
+title: Fix leaky constant issue in admin mode migration spec
+merge_request: 32074
+author: Rajendra Kadam
+type: fixed
diff --git a/changelogs/unreleased/rails-logger-cop-1.yml b/changelogs/unreleased/rails-logger-cop-1.yml
new file mode 100644
index 00000000000..c9b37eb9244
--- /dev/null
+++ b/changelogs/unreleased/rails-logger-cop-1.yml
@@ -0,0 +1,5 @@
+---
+title: Use applogger in project import state file
+merge_request: 32182
+author: Rajendra Kadam
+type: fixed
diff --git a/changelogs/unreleased/rails-logger-cop-2.yml b/changelogs/unreleased/rails-logger-cop-2.yml
new file mode 100644
index 00000000000..0685f503e44
--- /dev/null
+++ b/changelogs/unreleased/rails-logger-cop-2.yml
@@ -0,0 +1,5 @@
+---
+title: Use applogger in project.rb
+merge_request: 32183
+author: Rajendra Kadam
+type: fixed
diff --git a/changelogs/unreleased/rails-logger-cop-3.yml b/changelogs/unreleased/rails-logger-cop-3.yml
new file mode 100644
index 00000000000..b7de674cdb6
--- /dev/null
+++ b/changelogs/unreleased/rails-logger-cop-3.yml
@@ -0,0 +1,5 @@
+---
+title: Use applogger in chat_team.rb
+merge_request: 32184
+author: Rajendra Kadam
+type: fixed
diff --git a/spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb b/spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb
index 669e31618a3..77d8dd002e3 100644
--- a/spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb
+++ b/spec/migrations/20191125114345_add_admin_mode_protected_path_spec.rb
@@ -4,10 +4,9 @@ require 'spec_helper'
 require Rails.root.join('db', 'migrate', '20191125114345_add_admin_mode_protected_path.rb')
 
 describe AddAdminModeProtectedPath do
-  ADMIN_MODE_ENDPOINT = '/admin/session'
-
   subject(:migration) { described_class.new }
 
+  let(:admin_mode_endpoint) { '/admin/session' }
   let(:application_settings) { table(:application_settings) }
 
   context 'no settings available' do
@@ -30,7 +29,7 @@ describe AddAdminModeProtectedPath do
     application_settings.create!(protected_paths: '{a,b,c}')
 
     protected_paths_before = %w[a b c]
-    protected_paths_after = protected_paths_before.dup << ADMIN_MODE_ENDPOINT
+    protected_paths_after = protected_paths_before.dup << admin_mode_endpoint
 
     expect { migrate! }.to change { application_settings.first.protected_paths }.from(protected_paths_before).to(protected_paths_after)
   end
@@ -38,13 +37,13 @@ describe AddAdminModeProtectedPath do
   it 'new default includes admin mode endpoint' do
     settings_before = application_settings.create!
 
-    expect(settings_before.protected_paths).not_to include(ADMIN_MODE_ENDPOINT)
+    expect(settings_before.protected_paths).not_to include(admin_mode_endpoint)
 
     migrate!
 
     application_settings.reset_column_information
     settings_after = application_settings.create!
 
-    expect(settings_after.protected_paths).to include(ADMIN_MODE_ENDPOINT)
+    expect(settings_after.protected_paths).to include(admin_mode_endpoint)
   end
 end
diff --git a/spec/models/project_import_state_spec.rb b/spec/models/project_import_state_spec.rb
index cb34d898a6e..0b6b858daa8 100644
--- a/spec/models/project_import_state_spec.rb
+++ b/spec/models/project_import_state_spec.rb
@@ -57,6 +57,25 @@ describe ProjectImportState, type: :model do
     end
   end
 
+  describe '#mark_as_failed' do
+    let(:error_message) { 'some message' }
+
+    it 'logs error when update column fails' do
+      allow(import_state).to receive(:update_column).and_raise(ActiveRecord::ActiveRecordError)
+      allow(Gitlab::AppLogger).to receive(:error)
+
+      import_state.mark_as_failed(error_message)
+
+      expect(Gitlab::AppLogger).to have_received(:error)
+    end
+
+    it 'updates last_error with error message' do
+      import_state.mark_as_failed(error_message)
+
+      expect(import_state.last_error).to eq(error_message)
+    end
+  end
+
   describe '#human_status_name' do
     context 'when import_state exists' do
       it 'returns the humanized status name' do