Prevent a database update on Geo secondaries

app/services/keys/last_used_service.rb

 module Keys
   class LastUsedService
+    prepend ::EE::Keys::LastUsedService
+
     TIMEOUT = 1.day.to_i
 
     attr_reader :key

ee/app/services/ee/keys/last_used_service.rb

+module EE
+  module Keys
+    module LastUsedService
+      def update?
+        raise NotImplementedError unless defined?(super)
+
+        !::Gitlab::Geo.secondary? && super
+      end
+    end
+  end
+end

spec/ee/spec/services/ee/keys/last_used_service_spec.rb

+require 'spec_helper'
+
+describe Keys::LastUsedService do
+  it 'does not run on Geo secondaries', :clean_gitlab_redis_shared_state do
+    key = create(:key, last_used_at: 1.year.ago)
+    original_time = key.last_used_at
+
+    allow(::Gitlab::Geo).to receive(:secondary?).and_return(true)
+    described_class.new(key).execute
+
+    expect(key.reload.last_used_at).to be_like_time(original_time)
+  end
+end

spec/services/keys/last_used_service_spec.rb

@@ -26,12 +26,7 @@ describe Keys::LastUsedService do
       # make sure we _only_ update last_used_at and not always updated_at.
       key = create(:key, last_used_at: 1.year.ago)
 
-      recorder = ActiveRecord::QueryRecorder.new do
-        described_class.new(key).execute
-      end
-
-      expect(recorder.count).to eq(1)
-      expect(recorder.log[0]).not_to include('updated_at')
+      expect { described_class.new(key).execute }.not_to change { key.updated_at }
     end
   end