Reset Prometheus metrics in ee/spec/services/geo/metrics_update_service_spec.rb

ee/spec/services/geo/metrics_update_service_spec.rb

@@ -68,8 +68,17 @@ describe Geo::MetricsUpdateService, :geo do
     }
   end
 
+  def reset_prometheus_metrics
+    matching_files = File.join(::Prometheus::Client.configuration.multiprocess_files_dir, "*.db")
+    Dir[matching_files].map { |filename| File.delete(filename) if File.file?(filename) }
+
+    # Can't use ::Prometheus::Client.reinitialize_on_pid_change because the PID didn't change
+    ::Prometheus::Client::MmapedValue.reset_and_reinitialize
+  end
+
   before do
     allow(Gitlab::Metrics).to receive(:prometheus_metrics_enabled?).and_return(true)
+    reset_prometheus_metrics
   end
 
   describe '#execute' do