Does not log failed sign-in attempts when in a GitLab read-only instance

ee/app/models/ee/user.rb

@@ -5,6 +5,7 @@ module EE
   # and be prepended in the `User` model
   module User
     extend ActiveSupport::Concern
+    extend ::Gitlab::Utils::Override
     include AuditorUserHelper
 
     included do
@@ -91,5 +92,10 @@ module EE
     def email_opted_in_source
       email_opted_in_source_id == EMAIL_OPT_IN_SOURCE_ID_GITLAB_COM ? 'GitLab.com' : ''
     end
+
+    override :increment_failed_attempts!
+    def increment_failed_attempts!
+      super if ::Gitlab::Database.read_write?
+    end
   end
 end

ee/spec/models/ee/user_spec.rb

@@ -137,4 +137,18 @@ describe EE::User do
       end
     end
   end
+
+  describe '#increment_failed_attempts!' do
+    subject(:user) { create(:user, failed_attempts: 0) }
+
+    it 'logs failed sign-in attempts' do
+      expect { user.increment_failed_attempts! }.to change(user, :failed_attempts).from(0).to(1)
+    end
+
+    it 'does not log failed sign-in attempts when in a GitLab read-only instance' do
+      allow(Gitlab::Database).to receive(:read_only?) { true }
+
+      expect { user.increment_failed_attempts! }.not_to change(user, :failed_attempts)
+    end
+  end
 end